Your GTM Preview Shows Events Firing. Your GA4 Has Never Seen Them.
Your GTM Preview shows a green check. Every tag fires. You publish the container, check GA4, and see nothing. 31.5% of your visitors run ad blockers that block GA4 in production—GTM Preview Mode bypasses every one of them. The two environments aren’t the same. They’ve never been the same. GTM Preview runs in a sandboxed … Read more