Likely, because I have received PMs from other users here at FSO (the last one on 9 July 2021), and have not altered the settings recently.
You may use TMO for PMs instead, that works.
AFAIKS, there are two settings WRT PMs:
- User Profile → Notifications → Messages → Allow other users to send me personal messages
This is checked (i.e, on), which is the default. - User Profile → Notifications → Users →
- Ignored
List is empty - Muted
List is empty - Only allow specific users to send me personal messages
This is unchecked (i.e, off), which is the default.
- Ignored
AFAICS, there is nothing I can do to make PMs working.
Hence you might want to file a bug report.