Microsoft 365 Alert – Service Degradation –  Microsoft Teams – Users were unable to open or access any Microsoft Office files directly within Microsoft Teams – RESOLVED

28/08/2025 09:00:00 AM

NHSmail Reference: INC46614355

Microsoft Reference: TM1143347

Issue Status: RESOLVED

Issue Description: Some users were unable to access or open any Microsoft Office files within Microsoft Teams

More info: Any attempt to open, view, or access Microsoft Office files within the Microsoft Teams service including team channels and tabs would have failed.

While Microsoft focused on remediation, affected users were able to open impacted files by selecting the alternate “Open in desktop” or “Open in browser” options as a workaround.

Impact was specific to Microsoft Office documents embedded into Microsoft Teams. Specifically, this affected products such as Microsoft Word, Microsoft Visio, Microsoft Excel, Microsoft PowerPoint, and Microsoft OneNote files.

Final Update: 28/08/2025 09:01:00 AM – Microsoft have completed deployment to all affected environments and have validated through customer feedback and monitoring that the issue has been resolved.

Scope of impact: Any user attempting to open embedded Microsoft Office files directly within Microsoft Teams was impacted.

Next Steps: Microsoft are analyzing their CDN handling code changes and trends to better understand and prevent similar issues from occurring in the future.

They will provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business day.