We're using Teams for our seminars at university, and were excited when breakout-rooms rolled out. But, we've been unable to use breakout-rooms because there are always some students showing as 'guests'. Guests are greyed-out and can't be assigned to breakout rooms.
It happened to me last week - I'd joined in the normal way, but I was registered as 'guest'. Also, my screen looked different - the controls were at the bottom of the screen instead of the top, there were less of them, and there was a 'hang up' icon instead of 'leave'. We've tried making sure everyone have accepted the Teams invitation, and left and rejoined, but it hasn't made any difference. Help!!!!