This Teams mic volume control behavior is simply preposterous!
I just bought a brand new USB mic to upgrade the rather poor audio quality when using the built-in mic of my laptop during Teams meetings.
The USB mic is a clear improvement when testing it with some basic recording software like Audacity, but completely useless for use in Teams: mic level is reduced to 1%, basically completely muting the mic...
As the USB mic is a higher quality podcast type of mic, it is far more sensitive than the typical built-in mic, so I guess Teams somehow feels the need to dial the volume all the way down because the mic (which doesn't have any kind of noise suppression
built in) is picking up way more sounds than a built-in mic does.
Teams settings really should include some sensitivity dials to allow users to finetune to different mics rather than only provide automatic mic leveling clearly "optimized" for poor quality built-in mics, typically already including some sort of noise suppression.