Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users may be unable to begin onboarding for Microsoft Defender for Endpoint or Defender for Office 365 – ONGOING

Announcements Shagufta Naaz

16/06/2026 09:13:00 AM

NHSmail Reference: INC46852549

Microsoft Reference: DZ1392272

Issue Status: ONGOING

Issue Description: Some users may be unable to begin onboarding for Microsoft Defender for Endpoint or Defender for Office 365.

More info: As a workaround, users can open the file in the Excel desktop app instead.

Current Update: 16/06/2026 09:13:00 AM –Microsoft has deployed the solution and they are reaching out to a subset of affected users to validate the impact has been remediated.

Scope of impact: Some users attempting to begin onboarding for Microsoft Defender for Endpoint or Defender for Office 365 may be impacted.

Root cause: A recent service update to introduce an additional authorization check is resulting in the impact.

Next update by: Tuesday, June 16, 2026, at 2:00 PM UTC