Teams Room (Crestron UC) cannot join an ongoing discussion, unless there's a gap of silence.

This should be a fun discovery, we just found the captioned issue happened to one of our clients' sites, all of their Teams Room have the same problem.

When the room's Teams Room app is going to join an ongoing Teams meeting, and at the same time there's participants having a discussion in the meeting, the newly joined Teams Room app would not be able to contribute in the discussion after it successfully joins the meeting.

The Teams Room app would not show the microphone as muted, neither it will highlight the Teams Room camera view to indicate "speaking" status.

You can talk and talk in the Teams Room room but you won't be able to interupte the ongoing discussion until, there's a gap of silence appears, for just a few seconds, around 5s, if you grap this chance to speak up, you would be able to speak for the first time since your joining. And from that moment, everything will be normal, you won't lose your voice for the second time.

Please note, I'm not talking about if you joined the meeting as the 5th partcipant, or with even greater number of total participants. We are talking about a total of 3 participants only. If you joined as the 3rd participant, you'll encounter the problem. There're two key requirements to repeat the symptom:

1. You join with the Team Room app, not Personal Teams;
2. The people already in the meeting, need to speak/make sound when you first join the meeting and try to speak for the first time.

I also ruled out result of AEC by only using headsets in the meeting.

I have video record of the issue for easier understanding, and I have conducted similar tests with different sets of Crestron UC, in different rooms, even tested on a newly restored set of Teams Room. I'm planning to do similar test with other brands of Teams Room equipment, just to compare.

Please feel free to share your experience in similar issue. I'm dying to find out the reason behind it.