62594: Acronis Backup Cloud: Office 365 backup fails with "Cannot back up the primary mailbox of an Office 365 user"

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Applies to: 


Office 365 backup fails with:

CODE O365MailboxPrimaryMbxBackupError
MESSAGE Cannot back up the primary mailbox of an Office 365 user: 'folder: mailbox primary root: token validation failed'


Required permissions have been revoked from Acronis Agent in Office 365.


Re-register Office 365 account:

  1. In the backup management console, navigate to Devices -> All devices.
  2. Click Add.
  3. Select Microsoft Office 365 for Business.
  4. Confirm granting permissions when prompted.




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