Participants unable to unmute themselves?

i have the same problem on 5.17.5 (2543) linux-client. 5.16.10 works fine (my host uses this version on windows)

I am able to reproduce this problem on 5.17.5 (2543) Linux client as well.  It does not seem to be limited to any one host or host organization.  It's become very disruptive to my workflow to have to switch to an entirely different computer (a spare Windows laptop) in order to participate on Zoom calls. 

SOLVED:  I have an update that will hopefully help my fellow Linux users on this thread and anyone else that finds this thread.  Credit where due, a good friend of mine actually knew the answer to this having experienced it firsthand.

The problem can only be reproduced when the host is recording the meeting.  When you join a meeting that is being recorded, the Zoom client presents a dialog indicating the the host is recording the meeting, and you must click "OK" on this dialog in order to be allowed to unmute yourself.  

On the Windows client, this dialog is very noticeable. It's floating right above the Unmute button.  However, on the Linux client, it's in a "doorhanger" at the top of the Zoom window. I had no idea it was there until it was pointed out to me.  The "OK" button is embedded in the doorhanger dialog and is barely noticeable unless you are looking for it.