Can't switch audio in on version 5.10.6

Hello @fallingrock,
My name is Brandon. Thanks for joining the Zoom Community! Thank you for bringing this to our attention. May I ask that you create a support ticket so that we can pass on this information to our Engineering teams for further review?

I finally figured out how to fix this issue.  I am using the Pulse Audio Volume control in Xubuntu.  when I open it and go to the recording tab (and later the same for playback) I noticed that the Google Chrome browser was using this function, which I thought was wrong.  However I discovered that my Zoom launcher was actually starting a Chrome tab and calling a Chrome app for Zoom.  I went to the Chrome settings and opened the extensions page and saw the Zoom extension for Chrome.  I deleted this extension.  Then I googled & downloaded the Zoom app for Linux as a .deb file into my downloads folder.  I installed it by clicking  the downloaded file and it installed using the Software tool.  You could also install the Gdebi app which lets you install downloaded .deb software packagethat are not be in a Ubuntu repository, and use Gdebi to install the Zoom .deb file. 

Anyway, I then started the new Zoom native app and launched a new meeting.  Then the the PulseAudio Volume control app, the Zoom engine showed up on the playback and record tabs, so I knew Zoom had access to the audio.  In Zoom I had to select the right microphone ( I have a couple since my internal PC microphone is Kaflooey) and now the audio works with Zoom.  I found this on another Zoom community post, but it was using a different (Gnome) volume control app, but I can't find that post now to refer you too it.  ANyway I hope this works for you or you already fixed it yourself.