Mono USB sound devices do not record any audible sound, despite showing an indication of it
If a USB recording microphone is capable of mono only, no actual audible sound is recorded, despite waves indicating sound is coming through. The microphone does work with all other applications, like Zoom, or MS Teams.
When a recording's in stereo mode, then mono-only USB microphones do not record sound either, but neither they show any indicating waves then either.