Tested audio and microphone then doesn't work on zoom meeting

With a single client my mic and audio doesn't work when I join their meeting even though I tested both and they worked just before entering the meeting.  All the clients could hear each other but I could not hear nor be heard.  Since the mic and speaker using a Jabra plugged in headset tested correctly, I am at a stand still and we then have to switch to MSTeams.  It is highly unprofessional for me to not be able to figure this out but I'm stumped. When I switch to MS Teams the headset works just fine.