I just came off an hour call.
It picked the wrong microphone and…at the end I got "failed"
Likely it didn't hear the record - but if I'm in a meeting and we're at minute 6? Internally you should be notifying me if nothing is heard/recognized. Just start a process that quickly checks after a couple of minutes a snippet of sound (or use something real time) and if NOTHING is being recognized, Alert the user.