when I want to warn the participants in breakout rooms that their time is almost up, they do not see either my message ("broadcast message to all" feature) nor any kind of countdown (I do see countdown as a host).
Any idea how to solve this? How come they do not see anything when I broadcast a message? (I am sure I do everything right when I try to broadcast the "message to all" since there are no similar issues during the rest of my meeting.)
IT sounds as if you are doing it correctly. Is it possible they are just not noticing the messaging as it appears at the top of the screen instead of the bottom right where people are used to looking at notifications?