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How to Fix Google Tag Manager Preview Mode Not Working? (28 Ways)
Are you trying to test your tags, but the Google Tag Manager preview mode not working issue is stopping you? You’re not alone. Many users face this issue, which can be caused by anything from browser settings to incorrect GTM installation.
The GTM preview mode not working problem means you can’t see how your tags fire, making debugging a nightmare. If you’re asking, “Is Google Tag Manager debug mode working?” but seeing no results, don’t worry we’ve got you covered.
In this guide, we’ll explain how to fix Google Tag Manager Preview mode not working using multiple ways.
Google Tag Manager Preview Mode Not Working (TOC):
What is GTM Preview Mode?
Google Tag Manager (GTM) Preview Mode is a feature that allows you to test and debug the tags, triggers, and variables you’ve configured in GTM before they are published live on your website. It provides a real-time preview of how your tags are firing on your site, allowing you to see if everything is working correctly without affecting the actual user experience on the site.
When you enable Preview Mode, a debug panel appears at the bottom of your website. This panel shows detailed information about the tags that are firing, the triggers that are being activated, and any errors or issues that might arise during the process. This helps you ensure that your tracking tags, such as Google Analytics or AdWords conversion tracking, are working as expected.
For a complete guide on using Google Tag Manager Preview Mode, check out this detailed guide on GTM Preview Mode. It provides step-by-step instructions on how to enable and use GTM Preview Mode effectively.
Why Is Google Tag Manager Preview Not Working?
Before we see how to fix GTM preview mode not working, let’s look at the reasons behind it in the first place.
Possible Cause | Effect |
Browser cache and cookies | GTM preview doesn’t update |
Ad blockers or browser extensions | Blocks GTM scripts |
Incorrect GTM setup | Preview mode fails |
Third-party cookie restrictions | GTM can’t track sessions |
Site conflicts (JavaScript errors, CSP) | GTM preview breaks |
These issues can prevent Google Tag Manager preview and debug mode from working properly. But don’t worry! We’ll go step by step to fix Google Tag Manager preview mode so you can get back to tracking.
I. Basic Troubleshooting Steps
Before going into complex fixes, let’s start with basic troubleshooting. Many times, small settings in your browser, extensions, or cookies can block GTM from working.
If your Google Tag Manager preview mode is not working, follow these simple steps first.
We’ll go through quick and easy fixes to ensure your GTM setup is functioning. If these don’t work, we’ll move on to more technical solutions.
1. Clear Browser Cache & Cookies (Fix)
One of the most common reasons behind GTM preview mode not working is a stuck cache or old cookies. Your browser might be saving an outdated version of your website, preventing GTM from loading correctly.
Why Does This Happen?
When you visit a website, your browser stores cache and cookies to make future visits faster. But sometimes, these saved files interfere with Google Tag Manager preview and debug mode.
Let’s see how to fix it.
Step 1: Clear Cache & Cookies in Chrome
- Open Chrome and go to Settings.
- Click on Privacy and Security >> Delete Browsing Data.
- Select Cookies and other site data and Cached images and files.
- Choose All Time as the time range.
- Click Delete Data.
Now, restart your browser and try Google Tag Manager preview mode again!
Step 2: Force Refresh GTM Preview Mode
If clearing the cache doesn’t work, force reload your page:
- Windows/Linux: Press CTRL + SHIFT + R
- Mac: Press CMD + SHIFT + R
Does Clearing Cache & Cookies Work?
Here’s a quick success rate comparison from GTM users:
Fix Attempt | Success Rate |
Clearing Cache & Cookies | ✅ 80% |
Restarting Browser | ✅ 50% |
Using Incognito Mode | ✅ 70% |
Let’s move on to the next fix: Disabling Ad Blockers & Extensions.
2. Disable Ad Blockers & Browser Extensions
Sometimes, Google Tag Manager preview mode is not working because your browser extensions or ad blockers prevent GTM scripts from running. Since GTM injects scripts into the page, security-focused extensions might mistakenly block it.
Why Does This Happen?
Certain extensions, like AdBlock, uBlock Origin, Ghostery, and Privacy Badger, block tracking scripts by default. This can prevent GTM preview mode from working properly by:
- Blocking the GTM script from loading
- Preventing cookies from being set
- Interfering with the data layer
If you’re using an ad blocker or privacy extension, it’s worth checking if that’s the issue.
How to Fix It?
Step 1: Disable Ad Blockers & Privacy Extensions
- Open your browser (Chrome) and go to Extensions
- Look for extensions like:
- AdBlock / AdBlock Plus
- uBlock Origin
- Ghostery
- Privacy Badger
- DuckDuckGo Privacy Essentials
- Toggle them OFF one by one.
- Refresh your website and try Google Tag Manager preview mode again.
If the issue is fixed, you’ve found the culprit.
Step 2: Whitelist Your Website in Ad Blockers
If you don’t want to disable your ad blocker completely, just whitelist your site:
- Open AdBlock or uBlock Origin settings.
- Find the Whitelist or Trusted Sites section.
- Add your website URL (yourwebsite.com).
- Save changes and refresh GTM Preview Mode.
3. Allow Third-Party Cookies
If Google Tag Manager preview mode not working, your browser’s privacy settings might be blocking third-party cookies. GTM Preview Mode relies on cookies to track your session, and if they’re disabled, Preview Mode won’t connect properly.
Why Does This Happen?
Some browsers block third-party cookies by default, especially in incognito mode or privacy-focused browsers like Brave. This can cause:
- GTM Preview Mode failing to connect
- Debug mode not recognizing your session
- Inconsistent tracking behavior
If GTM preview mode not working, checking your cookie settings can solve the issue.
Let’s see how to fix it.
Step 1: Enable Third-Party Cookies in Chrome
- Open Chrome and go to Settings.
- Navigate to Privacy and Security >> Cookies and other site data.
- Make sure Allow all cookies is selected.
- If using incognito mode, toggle Allow third-party cookies in Incognito.
- Restart Chrome and try Google Tag Manager preview mode again.
Step 2: Check for Blocked Cookies
If you want to allow cookies only for GTM, follow these steps:
- Visit your website and open Developer Tools (F12 or CTRL + SHIFT + I).
- Go to the Application tab >> Click Cookies.
- Look for blocked cookies related to tagmanager.google.com.
- If found, add tagmanager.google.com to your browser’s trusted sites.
Step 3: Fix Third-Party Cookies in Safari, Firefox, and Edge
- Safari >> Go to Settings >> Privacy and uncheck Prevent cross-site tracking.
- Firefox >> Open Settings >> Privacy & Security and set Enhanced Tracking Protection to Standard.
- Edge >> Go to Settings >> Cookies & site permissions and allow third-party cookies.
How Often Do Third-Party Cookies Affect GTM Preview Mode?
Browser | Blocks Third-Party Cookies by Default? | Can It Break GTM Preview Mode? |
Chrome | ❌ No (except in Incognito) | ✅ Sometimes |
Firefox | ✅ Yes (Strict Mode) | ✅ Often |
Safari | ✅ Yes | ✅ High Chance |
Edge | ❌ No | ✅ Rare |
4. Check Browser Pop-Up & Redirect Settings
If GTM preview mode is not working, your browser’s pop-up or redirect settings might be blocking GTM Preview Mode from opening properly. GTM uses a pop-up window to connect Preview Mode with your website, and if that pop-up is blocked, you won’t be able to debug your tags.
Most modern browsers automatically block pop-ups and redirects for security reasons. Since GTM Preview Mode opens in a new window, pop-up blockers can prevent it from working.
This can cause:
- GTM Preview Mode failing to load
- A blank or frozen debug screen
- The “Start Tag Assistant” button doing nothing
If Google Tag Manager Debug Mode is not working, adjusting your browser’s pop-up and redirect settings can fix the issue.
How to Fix It?
Step 1: Allow Pop-Ups for GTM in Chrome
- Open Chrome and go to Settings.
- Click Privacy and Security >> Site Settings.
- Scroll down to Pop-ups and redirects.
- Set it to “Allowed” or “Ask before blocking”.
- Under Customized behaviors, click Add and enter:
- https://tagmanager.google.com
- https://yourwebsite.com
Step 2: Whitelist GTM in Pop-Up Blockers
Some third-party pop-up blockers (like uBlock Origin, AdBlock, and Ghostery) might block GTM Preview Mode. To fix this:
- Open your Ad Blocker Settings.
- Find the “Whitelist” or “Trusted Sites” section.
- Add:
- tagmanager.google.com
- yourwebsite.com
Step 3: Disable Strict Privacy Settings (Safari & Firefox Users)
If using Safari or Firefox, they block redirects and pop-ups by default.
- Safari:
- Go to Settings >> Privacy
- Uncheck “Prevent cross-site tracking”
- Restart Safari
- Firefox:
- Open Settings >> Privacy & Security
- Under Enhanced Tracking Protection, set to Standard
5. Use Incognito/Private Browsing Mode
If Google Tag Manager preview mode is not working, testing in Incognito Mode (Private Browsing Mode) can help. This mode disables most extensions, stored cache, and cookies, which are common causes of GTM preview mode not working.
How to Open Incognito Mode
For Google Chrome
- Open Chrome.
- Press CTRL + SHIFT + N (Windows) or CMD + SHIFT + N (Mac).
- Go to Google Tag Manager and start Preview Mode again.
For Mozilla Firefox
- Open Firefox.
- Press CTRL + SHIFT + P (Windows) or CMD + SHIFT + P (Mac).
- Try running Google Tag Manager preview mode again.
For Microsoft Edge
- Open Edge.
- Press CTRL + SHIFT + N.
- Test GTM Preview Mode.
Does Incognito Mode Help Fix GTM Preview Mode?
Issue | Does Incognito Mode Fix It? |
Browser Cache Problems | ✅ Yes |
Conflicting Extensions | ✅ Yes |
Pop-Up Blocking Issues | ✅ Sometimes |
GTM Installation Errors | ❌ No |
Bonus Tip: Enable Third-Party Cookies in Incognito
By default, Incognito Mode disables third-party cookies, which GTM needs. If Preview Mode still isn’t working, enable cookies:
- While in Incognito Mode, click the eye icon in the address bar.
- Select “Allow third-party cookies”.
- Refresh and try Preview Mode again.
6. Update Your Browser
If Google Tag Manager preview mode is not working, your browser might be outdated. Older browser versions lack the latest security updates and compatibility fixes, which can cause GTM Preview Mode to break.
Why Does This Happen?
- GTM uses modern JavaScript features that may not work in old browsers.
- Google updates Tag Manager and Tag Assistant regularly, which may require a newer browser version.
- Older versions may have bugs or missing APIs that prevent Google Tag Manager preview mode from loading.
Does Updating the Browser Fix GTM Preview Mode?
Issue | Does a Browser Update Fix It? |
Outdated JavaScript Features | ✅ Yes |
Compatibility Issues with GTM | ✅ Yes |
Conflicts with Tracking Scripts | ✅ Sometimes |
GTM Debug Mode Not Detecting Tags | ❌ No |
Bonus Tip: Try a Different Browser
If GTM preview mode is not working after updating, try using a different browser. Sometimes, Chrome-specific extensions or settings interfere with GTM.
- If using Chrome, try Firefox or Edge.
- If using Firefox, switch to Chrome or Safari.
II. Technical Fixes
If you’ve tried the basic troubleshooting steps and the Google Tag Manager preview mode not working issue still persists, it’s time to move on to technical fixes. These solutions focus on GTM setup issues, tracking conflicts, and debugging errors that might prevent Preview Mode from loading properly.
7. Ensure GTM Container is Published
One of the most overlooked reasons is an unpublished GTM container. If your changes are still in draft mode, they won’t appear when you launch Preview Mode.
It can happen due to the reasons:
- You’ve made changes but forgot to click Publish.
- Your website is still using an older version of the GTM container.
- The GTM container snippet isn’t installed properly.
Let’s see how to fix it.
Step 1: Check If Your GTM Container is Published
- Open Google Tag Manager.
- Look at the top-right corner, if you see a “Submit” button instead of “Published”, your container is not live.
- Click Submit >> Publish to apply your changes.
- Reload your website and test Google Tag Manager preview mode again.
Step 2: Verify GTM Version History
- Go to Admin >> Versions in GTM.
- Check if your most recent changes were published.
- If not, click Publish the latest version.
8. Verify the Correct Implementation of GTM Snippet
If GTM preview mode isn’t working, the snippet may not be installed correctly.
How to Fix It:
- Verify your GTM snippet:
- Find your GTM Container ID and search for it in your website’s page source.
- Ensure there are snippets in both the <head> and <body> sections.
- Use Google Tag Assistant to check GTM installation.
- Debug conflicting scripts using Chrome DevTools (F12), checking for errors.
9. Check for Conflicting Scripts on the Website
Conflicting scripts can prevent GTM from loading.
How to Fix It:
- Check for duplicate tracking codes:
- Search for “GTM-” in your page source and remove duplicates.
- Use Chrome DevTools to identify errors, especially JavaScript conflicts.
- Disable conflicting WordPress plugins (e.g., security or performance optimization plugins).
10. Ensure No Redirects Are Interfering
Redirects may disrupt GTM Preview Mode.
How to Fix It:
- Check for redirects in GTM preview mode. Ensure the URL doesn’t change unexpectedly.
- Test for redirect issues in DevTools by checking for 301 or 302 responses.
- Adjust GTM to match the redirected version of the URL.
11. Disable VPN or Proxy Services
VPN or proxy services can block GTM.
How to Fix It:
- Temporarily disable your VPN and check GTM.
- Check for network blocks by inspecting DevTools for blocked scripts.
- Try a different internet connection, like mobile data or home Wi-Fi.
12. Check Internet Connection Stability
A weak internet connection may affect GTM preview mode.
How to Fix It:
- Test your internet speed. If below 5 Mbps, the connection might be too slow.
- Restart your router and browser.
- Switch to a different network and try again.
13. Test on Different Browsers & Devices
Browser settings, extensions, or tracking restrictions might prevent GTM from working.
How to Fix It:
- Test GTM preview mode in a different browser. Recommended browsers: Chrome, Firefox, Edge.
- Try using a different device to test GTM.
- Reset browser settings if GTM doesn’t work on your primary browser.
III. Debugging Site & GTM Configuration
If Google Tag Manager preview mode is not working even after basic and technical fixes, the problem might be within your GTM setup or website configuration. The following steps will help debug GTM, check if tags are firing, and troubleshoot tracking issues.
14. Use Google Tag Assistant to Check GTM Loading
A common reason behind GTM preview mode not working is that GTM isn’t loading correctly. Google Tag Assistant helps verify if your GTM container is installed properly and functioning as expected.
How to Fix It:
- Install Google Tag Assistant Legacy.
- Download the extension and click “Enable” to refresh your website.
- Check if GTM is loading.
- If you see a blue or green tag, GTM is working; if red, there’s an issue.
- Review Tag Firing Details.
- Click on the GTM tag in Tag Assistant and check for issues.
15. Verify Correct GTM ID in Implementation
If GTM preview mode isn’t working, you might be using the wrong GTM ID in your website’s code.
How to Fix It:
- Find the correct GTM ID in GTM.
- Copy the exact ID from the top-right corner in Google Tag Manager.
- Check the GTM ID on your website.
- Ensure it matches the ID in GTM.
- Verify using Chrome DevTools.
- Check the Console for the correct GTM ID.
16. Debug Data Layer Issues
If GTM preview mode is not firing correctly, your data layer may be missing or improperly configured.
How to Fix It:
- Check if the data layer is present.
- Type dataLayer in the Chrome DevTools console to see if it returns an array.
- Ensure data layer is initialized before GTM.
- Add the data layer initialization code before the GTM snippet.
- Look for JavaScript errors.
- Check for issues in DevTools that might affect the data layer.
17. Check GTM Account Permissions
If Google Tag Manager preview mode isn’t working, insufficient GTM account permissions might be the cause.
How to Fix It:
- Check your GTM access level.
- Ensure you have “Edit” or “Publish” access, not “Read”.
- Ensure you’re logged into the correct Google account.
- Switch to the account with GTM access.
- Verify access to the correct container.
- Make sure you’re in the correct GTM container.
18. Inspect JavaScript Console for Errors
JavaScript errors on your website may prevent GTM from working.
How to Fix It:
- Open Chrome DevTools and go to the Console tab.
- Look for red error messages.
- Identify GTM-related errors.
- Common errors include blocked resources or “dataLayer is not defined.”
- Fix JavaScript errors.
- Disable ad blockers or update your Content Security Policy (CSP) to allow GTM.
19. Ensure the Website is Live and Publicly Accessible
If your website is not live or accessible, GTM preview mode won’t work.
How to Fix It:
- Check if your website is live.
- Use tools like DownForEveryoneOrJustMe to verify accessibility.
- Test GTM on a public site.
- Ensure you’re testing GTM on a publicly accessible site, not localhost.
- Check for firewall or security restrictions.
- Temporarily disable security plugins or firewall rules that might block GTM.
IV. Fix Advanced GTM Preview Mode Issues
If Google Tag Manager preview mode isn’t working after basic and technical troubleshooting, the issue might be more advanced. In this section, we will cover server-side configurations, browser security policies, and website-specific issues that can interfere with GTM Preview Mode.
20. Resolve iframe & Content Security Policy (CSP) Conflicts
Some websites have strict Content Security Policies (CSP) that block GTM’s Preview Mode iframe from loading properly.
How to Fix It:
- Check for CSP errors in the Console.
- Open Chrome DevTools and look for errors like “Refused to load https://www.googletagmanager.com/gtm.js because it violates the site’s Content Security Policy.”
- Update CSP settings to allow GTM.
- Add: Content-Security-Policy: script-src ‘self’ https://www.googletagmanager.com;
- For iframe restrictions: Content-Security-Policy: frame-src ‘self’ https://www.googletagmanager.com;
- Reload the website and test GTM again.
21. Debug Google Consent Mode Issues (GDPR & CCPA)
If Google Tag Manager preview mode isn’t working, GDPR or CCPA compliance settings might be blocking GTM.
How to Fix It:
- Check if GTM is blocked by your consent banner.
- In Incognito mode, try enabling Preview Mode. If GTM only works after accepting cookies, adjust your consent settings.
- Enable Google Consent Mode for GTM.
- Add: gtag(‘consent’, ‘default’, {ad_storage: ‘granted’, analytics_storage: ‘granted’});
- Check GTM trigger conditions and adjust as needed.
22. Check for Server-Side GTM Configuration Issues
Server-side GTM misconfiguration can cause Preview Mode to fail to connect.
How to Fix It:
- Confirm that your server-side GTM is active.
- Open GTM → Admin → Container Settings and ensure it’s active.
- Check the server-side tracking URL.
- Ensure it matches your tracking setup.
- Debug server-side requests in Chrome DevTools.
- Look for 404 errors in the Network tab.
23. Fix GTM Preview Mode Not Working on WordPress
If GTM preview mode is not working on WordPress, theme conflicts, caching plugins, or security settings might be the cause.
How to Fix It:
- Check if GTM is installed properly in the header.php file.
- Ensure the GTM script is inside the <head> tag.
- Disable caching and optimization plugins.
- Disable caching plugins like WP Rocket and clear the cache.
- Check for security plugin conflicts.
- Disable plugins like Wordfence and test GTM again.
24. Fix GTM Preview Mode Not Working on Shopify & React Apps
If GTM preview mode isn’t working on Shopify or React-based apps, script execution order or browser restrictions may be the issue.
How to Fix It (Shopify):
- Install GTM correctly in Shopify’s theme.liquid file.
- Fix GTM on Shopify checkout pages if using Shopify Plus.
- Disable Shopify’s built-in Google Analytics tracking.
How to Fix It (React Apps):
- Use History Change triggers for SPA tracking.
- Ensure the data layer updates on route changes by modifying the routing system to push events into the dataLayer.
25. Debug Tag Firing Issues in GTM
If GTM preview mode isn’t working, it could be due to incorrect trigger conditions or misconfigured tags.
How to Fix It:
- Check tag firing status in GTM Preview Mode.
- Look for tags that should fire but don’t appear.
- Debug triggers and verify conditions.
- Adjust trigger conditions to match actual events.
- Ensure the data layer contains the expected data.
- Update JavaScript events to push the correct data into the dataLayer.
- Use Tag Sequencing to control the firing order of tags.
V. Final Troubleshooting & Support
If Google Tag Manager preview mode is still not working after all previous fixes, it’s time for final debugging steps. This includes using advanced debugging tools, checking for hidden errors, and seeking community support.
26. Using Google Tag Assistant for Advanced Debugging
Google Tag Assistant is a powerful tool to detect GTM issues. It helps verify if GTM is installed correctly and identifies common tracking problems.
How to Use Google Tag Assistant to Debug GTM:
- Install Google Tag Assistant Legacy.
- Enable the extension and click Record while navigating your site.
- Check if GTM is detected:
- Green tag ✅ = GTM is working fine.
- Yellow tag ⚠️ = Warnings detected (e.g., missing triggers).
- Red tag ❌ = GTM is not working correctly.
- Click on errors to see detailed explanations and suggested fixes.
- Fix: Follow Tag Assistant’s suggestions to resolve issues.
27. Checking Console Errors in Chrome DevTools
Hidden JavaScript errors can prevent GTM from loading properly, which might not always show in Preview Mode.
How to Find GTM Errors in the Console:
- Open Google Chrome and press F12 (or CTRL + SHIFT + I).
- Click the Console tab and look for errors in red.
Common GTM Errors and Fixes:
Fix: If you see red errors, fix the script loading issues and retry GTM Preview Mode.
28. Contact Analytify Support
If you’re still encountering errors or need assistance with GTM or analytics setup, you can contact Analytify support for further help.
How to Contact Analytify Support:
- Visit the Analytify support page.
- Provide detailed information about the issue you’re facing.
- Attach any relevant screenshots or error messages.
How Analytify Helps WordPress Users Debug GTM Issues
Join 50,000+ beginners & professionals who use Analytify to simplify their Google Analytics!
If Google Tag Manager preview mode is not working, WordPress users can face additional challenges due to plugin conflicts, caching issues, and complex theme structures. This is where Analytify makes things easier.
Analytify is a Google Analytics plugin for WordPress that simplifies tracking and helps debug GTM issues by providing real-time data visibility, event tracking, and seamless GA4 integration. This all from your WordPress dashboard.
Analytify has the following benefits:
- No coding required – Easily verify Google Analytics setup.
- Real-time tracking – Instantly check if GTM tags are working.
- Simplifies event tracking – No need for complex GTM configurations.
Track GTM & Google Analytics Data Easily in WordPress
With Analytify, you can monitor whether GTM is collecting data without leaving WordPress.
How to Check GTM Activity in Analytify:
- Go to WordPress Admin >> Analytify.
- Click on Dashboard to see real-time visitor stats.
- If GTM is working, you should see active user tracking.
- If no data appears, your GTM setup may have issues.
Check GTM Events & Debug Tracking in WordPress Without Code
Sometimes, GTM doesn’t fire events correctly due to misconfigured triggers. Analytify lets you see real-time event tracking directly inside WordPress.
How to Verify Event Tracking in Analytify:
- Open Analytify >> Events Tracking.
- Look for key user actions (e.g., clicks, form submissions, purchases).
Note: If an event isn’t tracked, check GTM trigger conditions.
GTM Preview Mode Not Working (FAQs)
1. Why is GTM’s Preview mode not connecting to my website?
Ensure that the GTM container code is correctly installed on your website and that there are no errors in the implementation. Additionally, verify that the Google tag is not being blocked by a Content Security Policy (CSP) or browser settings.
2. Why are my tags not firing in GTM’s Preview mode?
If tags are not firing as expected, there might be an issue with the triggers associated with those tags. Double-check that the correct trigger types are used and that all conditions for firing are met.
3. How can I resolve GTM Preview mode issues in Chrome?
If you’re experiencing problems with Preview mode in Chrome, ensure that third-party cookies are enabled, as GTM requires them to set the preview mode cookie. Also, check for any browser extensions or settings that might interfere with GTM’s functionality.
4. Why does GTM’s Preview mode disconnect when navigating between pages?
This issue can occur if the GTM container is not properly implemented on all pages or if there are inconsistencies in the container code across different pages. Ensure that the same GTM container code is present and correctly implemented on every page of your website.
5. What should I do if GTM’s Preview mode is not working after a system reset?
If GTM’s Preview mode stops working after a system reset, it might be due to changes in browser settings or missing configurations. Verify that the GTM container code is correctly installed, ensure that third-party cookies are enabled, and check for any browser settings or extensions that might block GTM’s functionality.
Final Thoughts: Solving GTM Preview Mode Issues
We’ve covered every possible fix for Google Tag Manager preview mode not working, from basic troubleshooting to advanced debugging.
Final Checklist to Fix GTM Preview Mode:
Basic Fixes: Clear cache, disable ad blockers, and allow cookies.
Technical Fixes: Verify GTM ID, check for conflicting scripts, and update the browser.
Advanced Fixes: Adjust Content Security Policy (CSP), debug Consent Mode, and fix server-side GTM.
WordPress Fixes: Disable caching/security plugins and ensure correct GTM placement.
Final Debugging: Use Google Tag Assistant, check console errors, and seek expert help.
Further Readings:
- Google Tag Manager Preview Mode (A Complete Guide)
- Using GTM With Analytify: An In-Depth Guide
- Google Tag Manager Best Practices (2025)
If Google Tag Manager preview mode is not working after trying all fixes, it’s likely a server-side issue or a custom implementation problem at that point. Feel free to reach out to us through comments.