Does MeetMe in Asterisk 11.4 set some kind of exit status or a var so I
know for example if a conf ended normally or if someone gave a wrong conf number or pin?
There is no channel variable that provides that level of granularity. The closest available is the MEETMESECS channel variable, which tells you how many seconds the participant was in the conference.
You can find a full list on the Asterisk wiki:
Thanks Matt. I’ll see if I can use MEETMESECS.