Hi everyone.
I'm unsubscribing from this post, because it's being repetitive.
I just will describe mi situation, if it can helps:
I used for Teams calls a Sennheiser MOMENTUM In-Ear Wireless, without any problems, I could mute myself, and everything worked perfectly, until some months ago (I don't remember the month exactly, may be september/october 2022) when the beep when muted problem appeared, with no solution (someone told upgrading the headset firmware could help, but the model I own can't be updated). Last december I bought a Sennheiser MOMENTUM True Wireless 3, and they work perfectly with Teams.
My guess: MS updated something (an API call or something like that) that's too new, and only newer bluetooth headsets support it, unless they can be upgraded. My old Sennheiser MOMENTUM In-Ear Wireless works perfectly in Linux or Android, the issue is only in Windows.
Good luck with this!