"report abuse" button not working


I just enabled ENABLE_SHARE_LINK_REPORT_ABUSE to see what it does and who gets the message. As recipient of the link (no user) I receive the message, that changes had been saved when I file a report but I couldn’t figure out where and how.
There were no emails sent (I checked the mail and seafile logs) and my user who shared the file didn’t receive a notification whatsoever.

I am using version 9.0.9 CE in docker.

Are there any more logs or details I can check?