Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Users may see an error when opening the side panel for quarantined messages within Microsoft Defender for Office 365 – RESOLVED

31/07/2025 08:35:00 AM

NHSmail Reference: INC46592957

Microsoft Reference: MO1125593

Issue Status: RESOLVED

Issue Description: Users may see an error when opening the side panel for quarantined messages within Microsoft Defender for Office 365.

More info: Additionally, some quarantined messages may not be available within Security Operations Center threat hunting experiences, including email entity, threat explorer, and advanced hunting.

Microsoft’s investigation indicates all actions and operations within the quarantine experience are still functional despite users encountering an error in the side panel display stating “Something went wrong. Primary and secondary data missing.”

Final Update: 01/08/2025 08:30:00 AM – Microsoft have completed validation and deployment of the fix across all affected environments, and after monitoring the service, they’ve verified that this action successfully resolved the problem.

Scope of impact: Any user may be impacted when attempting to view quarantined messages within Microsoft Defender for Office 365.

Root cause: A recent feature update introduced a code issue resulting in impact to Defender quarantine experiences

Next steps: Microsoft are investigating how the recent feature update introduced a code issue that impacted Defender quarantine experiences, in order to prevent this problem from happening again.