Outage in Opti9
Veeam Backup for Microsoft 365 - SharePoint or OneDrive Backup fails with 'Cannot complete this action'
Resolved MinorIncident Report
Summary AI Generated
A Microsoft API error caused a subset of OneDrive and SharePoint backups to fail across multiple Veeam Backup for Microsoft 365 instances, with affected jobs displaying the warning "Cannot complete this action." The issue meant that not all items were successfully protected during the approximately 7-day incident window. The incident was resolved on July 30, 2026.
Opti9 has identified an issue affecting a subset of OneDrive and SharePoint backups, where not all items may be successfully protected due to an error returned by the Microsoft API.
For affected items, Veeam may display the following warning:
"Cannot complete this action. Please try again. Total count of failed items: X"
Additional information is available in Veeam Knowledge Base article KB4793: https://www.veeam.com/kb4793
Opti9 is actively monitoring the situation and is awaiting further guidance from Microsoft and/or Veeam.
This incident will be updated as additional information becomes available.
Components affected
Opti9 Veeam Backup for Microsoft 365 - yow03-m Opti9 Veeam Backup for Microsoft 365 - gsc3-m-portal Opti9 Veeam Backup for Microsoft 365 - pub1-par-vbo Opti9 Veeam Backup for Microsoft 365 - portal-m-gsc Opti9 Veeam Backup for Microsoft 365 - office365 Opti9 Veeam Backup for Microsoft 365 - yow01-m Opti9 Veeam Backup for Microsoft 365 - yow02-mTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
8 days ago - at 07/30/2026 06:42PM
This issue has been resolved. If you are still experiencing issues please reach out to our Support team.
IDENTIFIED
15 days ago - at 07/23/2026 07:43PM
Opti9 has identified an issue affecting a subset of OneDrive and SharePoint backups, where not all items may be successfully protected due to an error returned by the Microsoft API.
For affected items, Veeam may display the following warning:
"Cannot complete this action. Please try again. Total count of failed items: X"
Additional information is available in Veeam Knowledge Base article KB4793: https://www.veeam.com/kb4793
Opti9 is actively monitoring the situation and is awaiting further guidance from Microsoft and/or Veeam.
This incident will be updated as additional information becomes available.
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