Additional settings-related features and issues within Microsoft Teams for business
I'm just throwing a log on the fire and saying I have the same exact issue. Doesn't matter what Bluetooth headset I use: no microphone on a Lenovo ThinkPad X1 Carbon Gen 12. I've tried every single thing recommended in this thread, a suggested registry fix from Kimi, resetting Windows Audio and Bluetooth services, unpairing and repairing about a dozen times. No dice.
Issue persists on a Yealink headset with USB dongle, a Plantronics Voyager 5200 paired via Bluetooth, and Sony Bluetooth headset. Maddening. I'm rolling with a wired headset for the time being which works fine.