Microsoft 365 Alert – Service Degradation – Power BI – Users are unable to utilize mirroring with some Microsoft SQL servers in Microsoft Fabric – RESOLVED

Announcements Sourav Nandi

11/09/2025 08:35:00 AM

NHSmail Reference: INC46626598

Microsoft Reference: PB1150703

Issue Status: RESOLVED

Issue Description: Users are unable to utilize mirroring with some Microsoft SQL servers in Microsoft Fabric.

More info: This issue specifically impacts scenarios where there are delete operations on the Primary SQL database tables.

Users see the following error:

“We cannot convert the value null to type Number”

Final Update: 17/09/2025 08:22:00 AM – The fix deployment completed and after a period of monitoring, Microsoft have confirmed impact was remediated.

Scope of impact: Your organization is affected by this event, and the issue impacts any user attempting to mirror some Microsoft SQL servers in Microsoft Fabric.

Root cause: A code change within a recent service update, intended to improve query efficiency, in Microsoft Fabric is impacting mirroring with Microsoft SQL servers.

Next steps: To help prevent similar impact in the future, Microsoft are further reviewing their update release procedures to identify issues in code before being deployed.