I was solo running old raids yesterday, Blackwing Descent specifically, and I lost power causing me to D/C. I left for work after that only to come back today and try and run a m+, everytime i enter any dungeon or raid I am immediately teleported out and given the error message “You must be in a raid group to enter this instance”
Not sure if this will help, but worth a shot at least.
Type this exactly as shown while in the game:
/script LeaveParty()
If that doesn’t help, then I might also suggest a full UI reset (as detailed in support article linked below) to rule out any type of addon interference or file corruption.
Think they are trying to say that when they are attempting to do M+ dungeons, that they are getting the error message about needing to be in a raid group. It sounds like something glitched when they lost their connection while running Blackwing Descent yesterday.