Can only hear voice, but not guitar, in Zoom guitar meetings

I recently got a new laptop (Acer with Windows 11 Home) and when I am in Zoom for guitar lessons, I can hear voice clearly, but the guitar playing is muted/cannot be heard.  Some other participants can hear the guitar, others like me cannot.  I have tried all the recommended settings including setting the audio for musicians, but no success.  My old laptop, also an Acer with Wondows 11 Home, has no trouble hearing both voice & guitar in the same meetings.