If you’re implementing Google Analytics via Analytify, there’s no need to do it with Google Tag Manager as well. In fact, implementing Google Analytics with both Analytify and Google Tag Manager can skew your stats, since the tracking code will be on your site twice.
However, if you’re using Analytify, you can still use Google Tag Manager to implement other code (besides Google Analytics) without any issues.
If you want to use GTM for tracking then uncheck the tracking feature (the “Install JS option“ from plugin settings -> profile tab ) from Analytify and use only the reports feature. If you want to use e-commerce tracking for your WooCommerce add-on store then I recommend to exclude the Google Analytics tag from GTM and use Analytify Tracking with Reporting.
Note: We are working on GTM Tracking Integration with Analytify, stay tuned.