Microsoft 365 Alert – Service Degradation – Power BI – Some users are experiencing issues where DirectLake semantic models built on top of warehouses are failing to refresh – ONGOING

Announcements Shagufta Naaz

02/02/2026 09:05:00 AM

NHSmail Reference: INC46738956

Microsoft Reference: PB1225795

Issue Status: ONGOING

Issue Description: Users are experiencing issues where DirectLake semantic models built on top of warehouses are failing to refresh.

Current Update: 02/02/2026 09:05:00 AM – Microsoft is developing a code change intended to ensure that STO sends valid HTTP headers to DirectLake semantic models to resolve the underlying issue. They expect the deployment of the code change will have completed and the impact will be remediated by our next scheduled update.

Scope of impact: Your organisation is affected by this event, and some users that are using DirectLake semantic models built on top of warehouses are impacted. This section may be updated as our investigation continues

Root cause: An issue in recent deployment to the STO implemented a header handling change is causing the STO to send invalid HTTP headers to DirectLake semantic models and resulting in the failing refreshes.

Next update by: Thursday, February 5, 2026, at 6:00 AM UTC