Mobile App notifications not appearing

I have the zoom app running on my samsung s22 plus, android version 14.  All of a sudden, with some update perhaps, I am no longer seeing messages on team chat or some calls unless I open the app, then I see i've got unread messages and/or missed calls.  This is particularly true when the app hasn't received messages throughout the evening.  After opening the app, i'll get message notifications ,etc. but it seems to time out after a period.  Suggestions?