Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users are unable to release or preview ZAP email messages from quarantine in Microsoft Defender for Office 365 – ONGOING

07/04/2026 09:06:00 AM

NHSmail Reference: INC46791355

Microsoft Reference: DZ1272634

Issue Status: ONGOING

Issue Description: Users are unable to release or preview ZAP email messages from quarantine in Microsoft Defender for Office 365.

More info: Impact occurs in the Microsoft Defender for Office 365 security center.

Users receive an error message incorrectly stating that “The message has been deleted”. Users can attempt to retry to release the email messages and it may succeed.

Current Update: 07/04/2026 09:07:00 AM–Microsoft has confirmed that the rollback of the fix conducted on the portion of the affected environment is now complete. They are still monitoring the deployment of the fix to address newer email messages quarantined by ZAP. The saturation of the fix is currently at 85 percent, which they will continue to monitor to ensure full-service restoration.

Scope of impact: Your organization is impacted by this issue, and users are unable to release or preview quarantined ZAP email messages from the Microsoft Defender for Office 365 security center. This section may be updated as our investigation continues.

Root cause: A recent update to the service infrastructure that supports quarantined email messages contained a code issue, leading to impact.

Next update by: Tuesday, April 7, 2026, at 9:00 PM UTC