When Google Tag Manager preview mode is not working, the cause is usually a browser setting or an extension. An incorrect GTM installation is the third common cause. Test in an incognito window with extensions off first, then check the GTM snippet on the page.
Start with an incognito window and your extensions off. That rules out browser cache and ad blockers, the first two causes in the table below.
The GTM preview mode not working problem means you can’t see how your tags fire, making debugging a nightmare. You may ask, “Is Google Tag Manager debug mode working?” but see no results. Don’t worry, we’ve got you covered.
This guide covers the fixes in order, from basic browser checks to GTM installation problems.
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