Microsoft 365 Alert – Service Degradation – Power BI – Users may be unable to initiate Spark sessions or open and perform actions in Microsoft Fabric Notebooks – RESOLVED

Announcements Shagufta Naaz

01/06/2026 09:01:00 AM

NHSmail Reference: INC46838805

Microsoft Reference: PB1326495

Issue Status: RESOLVED

Issue Description: Users may be unable to initiate Spark sessions or open and perform actions in Microsoft Fabric Notebooks.

Final Update: 01/06/2026 09:01:00 AM –Microsoft has completed the manual restoration of the upstream service and after a period of monitoring, they confirmed impact is remediated.

Scope of impact: Users attempting to initiate Spark sessions or open and perform actions within Microsoft Fabric Notebooks may have been impacted.

Root cause: An issue with a routine maintenance procedure on an upstream supporting service was causing it to perform at suboptimal levels, which resulted in impact.

Next steps: To help prevent similar impact in the future, they are further working with the upstream service to understand how the maintenance procedure led to impact.