Hi All,
I had the same issue post a windows update. Not really sure what is trigger this problem, my Bose QC45 stopped working with the microphone, i was listening to music with it prefectly, no issues there but to make a call via teams was not ok and I was not able to use my headset with my laptop so was transferring the calls either in my phone or my ipad.
to me so far it seems like a windows update issue, i just update my operating system with the latest update from Microsoft for windows 11 and now the micrphone is successfully passing the test call in MS teams and showing active in all the sound setups.
Please update your laptop / workstation if you are facing similar issue that your bluetooth headset stopped working either with the headphone or with the microphone like me.
Please feel free to me know if this helped anyone.