Hi,
for about a week we have a problem with our O365 Exchange backup. It runs instead of about 4 Minutes without error now over 3 hours with errors.
We get the following error messages:
Failed to process mailbox [Mailbox does not exist]
Failed to process mailbox [Too many concurrent connections opened, Cannot open mailbox. Server = BEZP281M…...]
According to the joblog will be Exchange only setup detected with no public folder association.
The Access-Node is a Windows Server 2019 with PowerShell 5.1
use modern authentication is enabled
5 Azure Apps configured
10 max streams configured
Commvault Version 11.28.80


Does anyone have any idea how i can solve the problem?
Regards
Franz