Hosting Mumble for coworkers since Teams feels sluggish and monitored. We could use both simultaneously but Teams takes exclusive control of the microphone... so they actively Extinguished that too.

On macOS, You can try to prevent this by going to midi audio setup, create an aggregate device, add the microphone to it, and then use the aggregate device in teams. This also has the benefit that Teams will not automatically adjust the gain for you.