I have had to help so many end users with that it pains me.
"How can I stop this from happening again?"
Well, we can disable.other audio devices, but seeing as it's Windows 11 they may just re-enable good luck!
I ran into a user who's noise cancellation stopped working upon the rollout of "New" Teams. Tried diagnosing the microphone array, settings updates, firmware. No luck.
Know what worked? Both versions of browser based Teams!!! Ihatethemihatethemihatethem