I can confirm that Call of Duty Mobile does work with the beta update on the s10+.
I played a full round just to make sure and everything worked perfectly.
This was a completely fresh install of the game on this phone so that may have something to do with it.
One thing to check is the apps permissions which may have been revoked with the beta update.
It needs mic and storage permissions to work.
Let me know if this helps anyone fix it and get the game running.