Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Users may have experienced issues with multiple Microsoft 365 services – RESOLVED

29/09/2025 08:56:00 AM

NHSmail Reference: INC46641299

Microsoft Reference: MO1160527

Issue Status: RESOLVED

Issue Description: Users may have experienced issues with multiple Microsoft 365 services

More info: The impact to services and functionality included, but may not have been limited to:

Microsoft Power BI and Microsoft Fabric – Degraded performance and service unavailability

Windows 365 – Some users may have been unable to connect to their Windows 365 Cloud PCs

Microsoft Teams – Notifications pertaining to existing change notification subscriptions, specifically for new messages, message updates and changes in membership, weren”t delivering as expected.

Microsoft Defender for Identity – Users may have seen their update data take time to process, which could have resulted in incomplete information appearing on the identity inventory page.

Final Update: 29/09/2025 08:57:00 AM – Microsoft completed their period of monitoring service health and can confirm that the issue is resolved.

Scope of impact: This issue may have impacted any user in the Switzerland region attempting to utilize the impacted services and functionality in the More Info section of this communication.

Root cause: A section of infrastructure that supports connectivity for multiple Microsoft 365 services was performing below the expected service threshold.

Next update by: Microsoft are analyzing performance data and trends on the affected infrastructure to help prevent this problem from happening again.