Managing sound and video settings during Teams meetings and calls
The reality is that Teams is shockingly unreliable when it comes to Bluetooth device connection. This has been going on for years, and it's apparent that Microsoft either can't fix it, or don't want to. It is universal, across Android devices of many times, and across lots of audio device types.
It tends to work just perfectly with Google Meet, so I'd very strongly suggest that anyone with influence, use Google Meet in preference to Teams. Teams is also terribly bad at handing multiple user account profiles, as well as being part of Microsoft's failing suite authentication.
For a tech company, the fact that the issue is so pervasive is unforgivable.