Calls not coming through on Android Mobile App

Hello, I have an issue with the Mobile app that I am hoping someone else has experienced / fixed. When I receive a call the mobile app just shows "Zoom Notification" it does not ring or show who is calling or allow for answering. If I manually open Zoom I DO get the call coming through and can answer it but after I close the app after a few minutes it reverts back to the "Zoom Notification" with no call data. It seems like the app is going to "sleep" or a services is stopping and therefore not showing the call. I have.....
Given unrestricted battery access to the zoom app.
Removed Zoom from the "sleep" app on the phone and set to "Never Sleep"
Disabled "Remove permissions if app is unused"
and none of this seems to make a difference. If the app is open calls come through if I close the app I get a simple notification. Any experience or help would be appreciated. Thanks.