Microsoft 365 Alert – Service Degradation – Microsoft Teams – Admins may encounter delays of up to 10 hours for grading results on Microsoft Defender for Office 365 submissions page – ONGOING

24/03/2026 08:43:00 AM

NHSmail Reference: INC46807163

Microsoft Reference: DZ1289015

Issue Status: ONGOING

Issue Description: Admins may encounter delays of up to 10 hours for grading results on Microsoft Defender for Office 365 submissions page.

Current Update: 24/03/2026 08:43:00 AM– Microsoft has identified that an increase in requests has caused a section of infrastructure, responsible for processing email submission grading, to perform below acceptable performance thresholds resulting in impact. They are applying performance optimizations to improve processing capacities to remediate impact.

Scope of impact: Impact is specific to any admin served through the affected infrastructure expecting email submission grading.

Root cause: An increase in requests has caused a section of infrastructure, responsible for processing email submission grading, to perform below acceptable performance thresholds resulting in impact.

Next update by: Friday, April 24, 2026, at 10:30 AM UTC