Teams: Failed To Find Team MailboxOwner Account

Issue

While backing up a mailbox, the job is completed successfully, but your Veeam Data Cloud backup logs say that the job has completed with an error: Failed to find group owner account.

Summary

A team you are trying to back up does not have an owner attached, and you see the following error message in your Veeam Data Cloud backup session logs:

Cause

Veeam Data Cloud uses impersonation to back up items in Microsoft 365. Without an owner, Veeam Data Cloud is unable to impersonate Microsoft 365 teams. If no owner is assigned, it is seen as an orphaned group.

Resolution

Assign an owner to each of the Microsoft 365 teams you want to back up. For information on how to do this, see this Microsoft article.

Alternatively, if it is not necessary to back up some teams, you can exclude them from the backup. For more information, see Editing Flex Backup Policies.

Help And Support

If you have followed the steps outlined above, and the issue recurs in the next backup cycle, or you need help with performing these changes, you can contact Veeam Customer Support.

References

For information on how to check your backup session logs, see Viewing Backup Logs.