Mark solved even though you haven't read it🙂.
I noticed in SC Changelog hyperlink that flatpak was regressed back to a more 'launchable' state---it specifically mentions zoom.
So I updated, rebooted, open terminal , flatpak install zoom.us.US
, and VOILA!
It launched!
I found a zoom link someone sent from a couple days ago. Clicked on it. Zoom FINALLY launchesxdg-desktop-portal
and xdg-desktop-portal
finally functions.
After 6-8 weeks the zoom flatpak package is fixed for me.
As for all you who had unlaunchable flatpak packages, maybe this is the fix for you, too?
EDIT: thank you solus team