Microsoft 365 Alert – Service Degradation – Microsoft Purview – Users may have experienced delays in Data Loss Prevention alerts being generated or delivered in Microsoft Purview – RESOLVED

18/06/2026 09:37:00 AM

NHSmail Reference: INC46854757

Microsoft Reference: MP1394693

Issue Status: RESOLVED

Issue Description: Users may have experienced delays in Data Loss Prevention alerts being generated or delivered in Microsoft Purview.

More info: Some users may have experienced delays of up to two hours between DLP activity detection and alert generation in Microsoft Purview.

Current Update: 18/06/2026 09:38:00 AM –Microsoft has completed their monitoring period and confirmed that their performance optimizations have successfully remediated the delays in DLP alerts being generated and delivered.

Scope of impact: Impact was specific to users experiencing delays in DLP alerts being generated or delivered in Microsoft Purview.

Root cause: A subset of Microsoft Purview service infrastructure utilized to process and deliver DLP alerts was operating in an unhealthy state, resulting in impact.

Next Steps: Microsoft are analyzing the offending service infrastructure to isolate why it was unable to process and deliver DLP alerts as expected to further their understanding of the underlying impact scenario to determine what actions they can take to ensure similar impact scenarios don’t occur in the future.