We have a problem that we can’t log in to OWA and the mobile app a few times a day, but the error always goes away after a few minutes. We have Exchange 2019 CU7 and Windows Server 2019 servers.
You receive the following error message:
Invalid username or password, please try again later
During this time, the installed outlook works fine.
The error started about 1 month ago.
My question would be, where could the error be? In which log should we search?
(IIS log, AD log,? Log)