We kept the servers in suppression, still we received alerts on some servers during maintenance schedule
UIM 23.4 CU4
Any supported UIM version
The time on the target servers having issues was incorrect and needs to be corrected as per the timzone the server is located
If the time is incorrect there will be possibilities of getting alerts during the maintenance schedule
Verify externally the internet time for that timezone to compare/verify the time on the target server