M365 Backup common errors and actions
Overview¤
The following table will outline common errors that customers will receive in reports for their M365 backup service and the actions a customer can take to resolve them:
| Error | Solution |
|---|---|
| Cannot change WebPart ExportMode to ‘All’. WebPart will be skipped | To allow the "Export Mode" to be changed by Veeam Backup for Microsoft 365, you must enable the "Allow custom script" option for the affected SharePoint sites.
|
| Failed to find Team mailbox owner account | A user with an active Microsoft license needs to be assigned to the team's mailbox to resolve this error. |
| Mailbox/User does not have a valid M365 license | User without a valid M365 license needs to be provided with one to enable them as a mail enabled user. |
| Inside the portal restore enabled customers are only able to see their own mailbox and not others within the organisation | Customers must change scope inside the restore portal to restore objects from the entire organisation. |
| (Exchange) Failed to access mailbox. The SMTP address has no mailbox associated with it | This requires investigation of the backend mailbox and may be because the mailbox has been deleted. |
| (Exchange) Failed to access mailbox. Access is denied. Check credentials and try again | This is potentially an issue with the permissions of the impersonation account. |
| (Exchange) Failed to find group owner account | Orphaned or decommissioned mailbox that is without an owner. |
(SharePoint) Cannot change web part export mode to ‘All’, because custom scripting is disabled for site: <site name>. Web part will be skipped |
Known issue. Refer to the following to remove/reduce these warnings: Veeam KB4091 |
| (SharePoint) Item may have a virus reported by the virus scanner plug-in | The file appears to be locked by the virus software. Refer to: SharePoint Online or OneDrive for Business Backup Jobs fail with the Warning |
| (SharePoint) This site has exceeded its maximum file storage limit. To free up space, delete files you don't need and empty the recycle bin |
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