O365 Online Backup failed after update Maintenance Release from 11.28.89 to 11.28.93

Hi Team,

After the update to 11.28.93, our online backup goes into pending status and aborts after several restarts.

Does anyone have any idea why this is suddenly happening?

I see the following messages in the joblog:

1568  1920  11/17 07:23:03 339626 **** CVMailBackupCoordinator.exe started with command line [-j 339626 -a 2:927 -c O365_Exchange -m K19-xxxxxxx.ad.xxxx.de*k19-xxxxxxx*8400 -t 2 -r 0 -i 2 -jt 339626:8:1:0:0:19052 -mt 1 -cn K19-xxxxxxx -vm Instance001 ]
1568  1920  11/17 07:23:03 339626 Current diretory set to [C:\Program Files\Commvault\ContentStore\Base]
1568  1920  11/17 07:23:03 339626 VMName [Instance001]
1568  1920  11/17 07:23:03 339626 Mailbox Type [User Mailboxes]
1568  1920  11/17 07:23:03 339626 jobID [339626]
1568  1920  11/17 07:23:03 339626 virtualClientName [O365_Exchange]
1568  1920  11/17 07:23:03 339626 Operation = Backup
1568  1920  11/17 07:23:03 339626 CommCell ID [2]
1568  1920  11/17 07:23:03 339626 AppID/SubclientId [927]
1568  1920  11/17 07:23:03 339626 Virtual client name [O365_Exchange]
1568  1920  11/17 07:23:03 339626 Backup Level : 2
1568  1920  11/17 07:23:03 339626 Job token [339626:8:1:0:0:19052]
1568  1920  11/17 07:23:03 339626 Physical client name [K19-xxxxxxx]
1568  1920  11/17 07:23:03 339626 CommServeName=K19-xxxxxxxx.ad.kzvk.de, DetectedPlatformType=4
1568  1920  11/17 07:23:03 339626 JM Client  CVJobClient::initialize(): Got remote host [K19-xxxxxxx.ad.kzvk.de].
1568  1920  11/17 07:23:03 339626 JM Client  CVBkpJobClient::init(): Initializing job object with token [339626:8:1:0:0:19052].
1568  1920  11/17 07:23:03 339626 Init() - Initializing job control [token=339626:8:1:0:0:19052,cn=K19-xxxxxxxx], serverName [K19-xxxxxxxx.ad.kzvk.de], ControlFlag [1], Job Id [339626]
1568  1920  11/17 07:23:03 339626 Cvcl::init() - CVCL: Running in FIPS Mode
1568  1920  11/17 07:23:03 339626 CVJobCtrlLog::registerProcess(): successfully created file [C:\Program Files\Commvault\ContentStore\Base\JobControl\1.568]
1568  1920  11/17 07:23:03 339626 isCCSDbEnabled() - Use CCSDb Enabled [0] IsCloudLaptop [0] IsFSCoreLaptop [0]
1568  1920  11/17 07:23:03 339626 CvNetworkPool::initNetworkPool() - Creating the control thread
1568  1920  11/17 07:23:03 339626 Virtual client Id [832]
1568  1920  11/17 07:23:03 339626 AppType [137]
1568  1920  11/17 07:23:03 339626 AppMgr: vm=Instance001, commCellID=2, clientID=832, appType=137, appID=927, jobID=339626, ClientType=1.
1568  1920  11/17 07:23:03 339626 BackupSet GUID = 9343C247-E5A4-4853-9A6B-xxxxxx
1568  1920  11/17 07:23:03 339626 Current job first attempt start time = 1700202172 (0x01DA191E:7E540600)
1568  1920  11/17 07:23:03 339626 AppMgr: vm=, commCellID=0, clientID=832, appType=137, appID=0, jobID=0, ClientType=1.
1568  1920  11/17 07:23:03 339626 Exchange Cloud Region: [1]
1568  1920  11/17 07:23:03 339626 Discovery will use modern authentication.
1568  1920  11/17 07:23:03 339626 Found Azure AD connection details: Tenant:[xxxxxx-8xxx-4xxx-9xxx-beexxxxx] AppId:[xxxx-42c3-4xxx-xxxx-xxxxx564b]
1568  1920  11/17 07:23:03 339626 Found Azure AD Cloud Region: [1]
1568  1920  11/17 07:23:03 339626 Exchange online only environment detected
1568  1920  11/17 07:23:03 339626 No system accounts set
1568  1920  11/17 07:23:03 339626 Setup detected: Exchange online only
1568  1920  11/17 07:23:03 339626 Using  for LDAP
1568  1920  11/17 07:23:03 339626 No exchange online found. Please consider adding exchange online acocunt.
1568  1920  11/17 07:23:03 339626 Failed to set admin account
1568  1920  11/17 07:23:03 339626 main(66) - Failed to initialize BackupCoordinator

Kind regards

Franz