Exchange Online backups failing

Last post 05-13-2020, 10:30 PM by Anthony.Hodges. 3 replies.
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  • Exchange Online backups failing
    Posted: 02-05-2020, 3:22 PM
    Exchange online backups are failing for few users with the below error: Failed to process mailbox. Error message [The account does not have permission to impersonate the requested user.] Issue is we are having this error only on scheduled jobs. If I trigger the failed users individually they complete successfully. Current Version is V11 SP16 HPK24. Is this a known issue?Do we have any fix for this?Any information would be much appreciated. Thanks in advance.
  • Re: Exchange Online backups failing
    Posted: 05-13-2020, 1:42 AM

    Hi Shaks, I have seen the same problem for a small number of mailboxes on v11 16.25.  At the time of writing 16.51 is out and I cannot see any hotfixes that pinpoint resolution of this issue.

    Was it ever resolved for you?

  • Re: Exchange Online backups failing
    Posted: 05-13-2020, 10:25 PM

    Hi Anthony,

    Error message [The account does not have permission to impersonate the requested user.] is usually reference to impersonation rights via EWS.

    Ensure the steps to create an impersonation RoleGroup have been followed:

    If this has been done and you are seeing the above errors on some users still, the issue might be related to throttling from Microsoft. 



  • Re: Exchange Online backups failing
    Posted: 05-13-2020, 10:30 PM
    Thanks David, I didn't get to update my findings yesterday but I can confirm that when this Exchange Online error randomly occurs to some mailbox that it definitely relates to throttling and is not a Commvault problem.
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