Same issue. Sony 1000mx4's and yeti mic. I cannot use these together in MS teams. If I choose the Sony as output and Yeti as mic, I can hear the sound being turned off in MS teams as soon as a test call connects.
Was fine under win10 - I used the hands-free profile in MS teams, but no longer see the hands-free profile in teams. I do see two separate devices in device manager though, so windows seems to know about the hands-free profile, which I believe is a genuine bluetooth mode.
So, again, same issue. Seems like MS teams is hiding the bluetooth profile that we need.