I would like here to get some attention to a bug that exists for a while and has yet not been fixed. This bug occurs with the latest Teams ver. 1.3.00.25560 64bit on several versions of Linux, including Ubuntu 20.04, 18.04 and Mint.
During a call click Settings > Device Settings. The device settings tab will open on the right side. Keep the tab open while somebody in the call is talking. Although you may not speak at all, working with headphones and being in a very quite space, the volume indicator of your microphone will appear full for a few seconds, and then there will be a message that your microphone will be disabled because it is not working properly.
After that, the microphone remains disabled forever and the only possibility to turn it back on, is to get out of the call, restart teams and log back in.
It would be great if Microsoft could fix this bug, because flawless communication with voice calls is critical for our work.