Microsoft 365 Alert – Service Degradation – Power BI – Users can’t run Service Principal Name (SPN) queries in the Lakehouse SQL endpoint within Microsoft Fabric – RESOLVED

Announcements Sharmista Mohanta

27/08/2026 11:09:00 AM

NHSmail Reference: INC46920477

Microsoft Reference: PB1462284

Issue Status: RESOLVED

Issue Description: Users couldn’t run SPN queries in the Lakehouse SQL endpoint within Microsoft Fabric.

More Info: This issue specifically impacted users who were in Single Sign On (SSO) mode.

Final Update: 27/08/2026 11:10:00 AM – Microsoft has identified that a code issue introduced with a recent service update was causing the impact. They disabled the offending update and confirmed through monitoring service health telemetry that the impact has been remediated. environment.

Scope of impact: Your organization was affected by this event, and any user attempting to run SPN queries in the Lakehouse SQL endpoint while in SSO mode within Microsoft Fabric was impacted.

Root cause: A code issue introduced within a recent service update was causing the impact.

Next steps: Microsoft is reviewing their update procedures to understand why impact to SPN query functionality wasn’t caught during the testing phase. This will allow them to drive service improvements by proactively identifying similar issues in the future and improve their update testing processes.