Own Camera Preview not shown to the Meeting Member using it only

[GerNOTgREAT]

Hi Community, 

The preview cam in meetings is not visible (no error) on all our Teams Rooms, but only for the one using them. it looks the following for us in our conferenceroom. 

To the one we are inviting we are perfectly visible, as you can see within the next picture:

Even the preview section of the devices Teams-settings look fine and show the picture we need to see:

Tried some troubleshooting without success:

https://answers.microsoft.com/en-us/msteams/forum/all/camera-greyed-out-in-teams-call/d636e53b-54b3-....

https://answers.microsoft.com/en-us/msteams/forum/all/why-cant-i-see-myself-during-video-call-in-tea...

But both of those threads seem to work on other issues even if the questions look like our problem. 

The second thing is that most of the settings mentioned in those answers are not even accessible from our teams room.

Thank you for answering in advance. 

[#2]

@GerNOTgREAT have you tried stopping and restarting the video feed during the meeting. It's not uncommon for the video feed to not start correctly in Teams for some reason.

[#3]

We're starting to see the same issue in some of our rooms. Is there anyone on the MTR team monitoring this space? Curious if the latest MTR release caused this issue.

[#4]

@Martin-Finlayson Yes i tried it even without thinking it would help. The unproper start of teams is a known issue to me. But its curious that this exact issue is facing us from all our MTR around the world.