AH now I see. The microphone output IS SO QUIET I can barely hear it. Google Meet doesn't have this issue.
Moreover, I was adding audio output capture and Desktop Audio mixer was hidden. So I adjusted output volume for 1 instance only and it was always so much louder (thinking mixer doesn't work), that I cannot hear mic. I figured the latter out that I don't have to add Audio Output Capture source explicitly and I can adjust that volume.
But my mic output is unusable.
Not op but my setup would be webcam on screen, in the audio mixing (right click, advanced maybe) put each audio feed onto its own track for later editing
I can't picture anything wrong with a quick setup other than maybe the audio tracks all being mashed into track 1 by default. Would need more information