SUMMARY
I am using kubuntu 23.10, and have sound issues with zoom 5.16.6 (382). I have a Jabra Speak 510 running thorugh USB.
When I first connect to a meeting, I hear nothing (but apparently my mic does work, so others can hear me). If I open audio settings and switch the profile from Analog Stereo Output  + Mono Input to Digital Stereo Output  + Mono Input (or vice versa, it's the action of changing the profile that seems important), then the sound works. 
At seemingly random points during a zoom call, the sound dies and I have to switch profile again.
I never had this issue with kubuntu 22.04 LTS. I have not noticed similar problems applications which only output, eg vlc or clementine.

STEPS TO REPRODUCE
1. Join a zoom meeting

OBSERVED RESULT
No sound output until switching audio profile

EXPECTED RESULT
Sound should work without having to switch profile

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.111.0.0
Qt Version: 5.15.10
Kernel 6.5.0-13
Zoom 5.16.6 (382).

ADDITIONAL INFORMATION
I don't know if this is a zoom problem, an ubuntu problem, or a kde problem...