wonder if anyone is experiencing (or has experienced) the same.
I have set up many server-side setups with GTM for clients and the FB Test Event Tool always showd proper deduplication with the browser event being processed and the server event deduplicated.
However, recently (since about a month), I frequently don’t receive the browser event in the Test Tool and if it shows both events show as deduplicated. The server event always comes in.
I think the browser event fires properly as it shows in Pixel Helper and also the network request has a 200 status code. But it only shows up in the Test Event Tool when I have openend the Developer Tools for both the Test Event Tool tab and the website tab where the events are being fired. But even then, the browser events don’t show reliably.
This also happens for pixels/setups that showed up all fine before (didn’t change the setup).
Now in the overview tab the deduplication stats look good, so it is working, just the Test Event tools shows rubish.
Generally, I wouldn’t mind so much, but clients are frequently hesitant to believe that everything is working if the test event tool doesn’t show the expected views for deduplication.
I can’t for the life of me figure out what is going on. I reset browser cache, deleted cookies, even switched browser, but it is always the same. Also no ad or script blockers installed.
Any tips would be highly appreciated.