How to debug or Test your tags using the GTM preview mode?
Step 1: login to GTM Account
Step 2: Select website for which you want to see the preview mode.
Step 3: Click on the Preview button as shown in snapshot
Step 4: It will open 2 new Windows , in 1st window of Tag Assistance, you will need to add name of your website and other window your website will be open in Debug Mode.
Step 5.: As you are in Debug mode, so now you can test your tag and conversion code, and how they are working or not.
How Does Google Analytics 4 (GA4) works in Debug View?
Please note that GTM Preview mode also help you to Test Tags in Google Analytics 4 if you are on debug view
Please watch the below Video where we have shown, how GA4 and GTM works in Preview mode and how we can test the tracking code
