Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Some users may be unable to use search in multiple Microsoft 365 services from any connection method – RESOLVED

13/12/2023 08:36:00 AM

NHSMail Reference: INC40258448

Microsoft Reference: MO697715

Issue Status: RESOLVED

Issue Description: Users may be unable to use search in multiple Microsoft 365 services from any connection method.

More info: Affected apps include Microsoft Teams, SharePoint Online, and Exchange Online from any connection method.

Final Update: 14/12/2023 17:45:00 PM – Microsoft have completed the deployment of the fix to restore the affected .dll file across the impacted infrastructure, and routed traffic through healthy infrastructure while the deployment progressed. They’ve confirmed through telemetry monitoring that the mitigations applied have returned the service to a healthy state.

Scope of impact: Impact is specific to some users who are served through the affected infrastructure.

Root cause: A specific .dll file required to regulate searches in Microsoft Teams, SharePoint Online, and Exchange Online is absent, causing the impact to occur.

Next steps: Microsoft are reviewing their update and deployment procedures to ensure the appropriate actions are followed for this type of change in the future.