Veeam Backup for Microsoft 365 Modern App-Only Authentication Limitations

KB ID: 3146
Product: Veeam Backup for Microsoft 365 | Veeam Backup for Microsoft Office 365 4.0 | Veeam Backup for Microsoft Office 365 5.0 | 6.0 | 6a
Published: 2020-06-04
Last Modified: 2022-08-17
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Information

When adding a Microsoft 365 organization with Modern Authentication to Veeam Backup for Microsoft 365, there is an option to enable "Allow for using legacy authentication protocols." When this checkbox is not selected, Veeam Backup for Microsoft 365 will use a mode referred to as Modern App-Only Authentication.

When using Modern App-Only Authentication, the following limitations apply:

Backup

  • Discovery Search and Public Folder mailboxes are not supported.
  • Dynamic Distribution groups are not supported.
  • The type property for shared and resource/equipment mailboxes cannot be resolved. Such mailboxes will be available for backup with a general ‘User’ type (Note: This limitation only applies to creating a backup jobs and does not affect licensing).
  • SharePoint Web Parts can only be backed up if their ‘exportmode’ property is enabled. Non-exportable Web Parts are not supported. 

Restore

  • OneNote restore is not supported.
  • SharePoint Web Part customized template cannot be preserved upon a restore. All Web Parts will be restored with the default template.
  • The ‘Allow multiple responses’ setting in survey lists within team modern sites is not preserved upon a restore.

PowerShell

More Information

For a complete list of considerations and known limitations of Veeam Backup for Microsoft 365, review: Considerations and Limitations
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