Upgraded to Windows 11, now I can't hear anyone. How do I debug, please?

On a clean (well-maintained, no viruses or sketchy software) Windows  PC.  I recently moved to new HW and upgraded from WIndows 10 to Windows 11.  I updated my audio driver (Realtek) for the new Motherboard (Asus B760M-A-AX).  Everything works great, except.  When I go into zoom (using a USB logitech camera), The audio tests work fine, but I can't hear anyone else.  I tried uninstalling/reinstalling Zoom, and now when people are talking I get occasional badly distorted audio.  I have checked all audio settings in zoom and on my PC and all appears ok.  Video works fine, and they can hear me.  I just can't hear them.  I thought maybe zoom needed some permission but after the reinstall I do hear -something- but it's distorted and mostly silent.   I have the latest audio driver for my board, and all my other audio works fine.  I'm afraid I can't pinpoint whether it was caused by the HW upgrade or the windows upgrade :-(.    I don't think anyone will have the answer but I'm at a loss as to how to debug.  Any/all thoughts appreciated.

/j