Microsoft 365 Alert – Service Degradation – Microsoft Purview – Users may be unable to access activity explorer in the Microsoft Purview portal – RESOLVED

Announcements Shagufta Naaz

09/04/2026 09:00:00 AM

NHSmail Reference: INC46794121

Microsoft Reference: MP1274841

Issue Status: RESOLVED

Issue Description: Users may be unable to access activity explorer in the Microsoft Purview portal.

More info: Affected users may be unable to load Activity Explorer or may see it reported as unavailable due to licensing checks incorrectly returning ineligible results.

In some cases, users may also experience issues retrieving sensitivity labels when using the Azure Information Protection (AIP) unified labeling client.

Final Update: 14/04/2026 09:11:00 AM–: Following Microsoft restarting of affected services, thei internal service telemetry has verified that the impact has been remediated.

Scope of impact: Some users attempting to access Activity Explorer in the Microsoft Purview portal or retrieve sensitivity labels using the Azure Information Protection (AIP) unified labeling client may be impacted. This information may be updated as our investigation continues.

Root cause: A service-to-service authentication component was recently updated and is disrupting how licensing information is validated, causing some requests to be incorrectly identified as unlicensed and resulting in impact.

Next Steps: Microsoft are further analyzing the isolated updated component to help us improve their pre-deployment testing and validations and, in their effort, to prevent similar issues in the future.