I’ve had a moderator on my forum notice this happen twice now:
- I create a message with Users A, B and C
- I invite User D to the message
- I invite User E to the message
- User E receives no notification (bubble or email) of new replies in the message unless User D is the one replying (and it’s a blue bubble notification, not green)
I have SSO enabled, which might be relevant, but I’m not sure — I used to temporarily disable SSO so I could invite users to messages and apparently it happened then too.