@Alex T⚜️ , the problem came from different mode settings in my root instance and in my test instance, running in a subfolder of the root. Since I used the same API key and had both active, it confused the perspective system and it couldn't send a response. As Andrey said, 99 percent of support requests stem from user errors...

I get the reports now, but only on my system admin email account. Is there a chance that you could implement reports for moderator members, as well? Maybe as an addon to user reports in Studio Dash?