Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users’ NRT custom detection alerts were delayed or didn’t execute in Microsoft Defender for Office 365 – ONGOING

Announcements Arpan Das

16/01/2026 08:50:00 AM

NHSmail Reference: INC46786469

Microsoft Reference: DZ1265695

Issue Status: ONGOING

Issue Description: Users’ NRT custom detection alerts were delayed or didn’t execute in Microsoft Defender for Office 365.

Current Update: 31/03/2026 08:50:00 AM : Microsoft has investigated a problem in which users’ NRT custom detection alerts were delayed or didn’t execute in Microsoft Defender for Office 365 and confirmed that service is now restored. They will provide additional information in a closure summary within the “History” section of the “Service health” dashboard shortly.