in late on this discussion, so hope I’m on the right track!
you update to the latest build of Zoom and you will notice
that they have added the ability to turn on and off alerts
for screen readers in Settings/Accessibility. I only spotted
this yesterday when installing it for a client.
I don't know who's organizing the meetings
in question, but if you have the ability to contact them in
advance, there are settings they can tweak to make the
join/leave notifications be triggered only for the meeting
Host and Co-Hosts.
See this Zoom Support Page: https://support.zoom.us/hc/en-us/articles/115005756143-Changing-your-meeting-settings
and search on, "Sound
notification when someone join or leave."
Although this may not have a connection to text notification
of same, I'm willing to bet that it might. It's worth
checking out, at the very least.
Zoom is going to have a lot of refining to do, and for reasons
of accessibility plus a lot of others. I doubt that they
ever, in their wildest dreams, foresaw the app taking off as
quickly and gaining as many users as it has in a very short
period of time. While there are limited human resources for
tweaking Zoom, they certainly can't make changes for any
problems unless those problems are reported to them and the
changes that would help are spelled out.
Brian - Windows 10 Pro, 64-Bit, Version 1909,
gentleman is one who never hurts anyone's feelings
~ Oscar Wilde