I installed Teams on a new laptop with Windows 10. After installation, I see the microphone volume jumps directly between 42, and 73 every 1-2 seconds. It seems something is fighting for control of the microphone volume.
The microphone works fine while using GoTo meeting and Zoom, just not Teams.
I have unchecked the option to Allow applications to take exclusive control of this device. But this did not help. I have also tried several other common sense things, like updating drivers, etc.