Thanks for trying @awesomerobot 
!
The raw post data did not give me any clues, but I found more details in the log, so I fed them into an AI.
The response was very helpful, and might be something for you to look into.
I do have a user called “trust_level_0” for testing purposes and this might be an issue.
After changing status to status="standalone" the event appeared. 
Thanks again, hope this helps!
newbit1337