Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to connect to Azure Analysis Services live connection reports from Power BI desktop – RESOLVED

27/03/2026 09:20:00 AM

NHSmail Reference: INC46783900

Microsoft Reference: PB1262330

Issue Status: RESOLVED

Issue Description: Some users may be unable to connect to Azure Analysis Services live connection reports from Power BI desktop.

More info: As a workaround, affected users could disable the “Sign-in experience for data sources” option in the security settings of Power BI Desktop and restart the application to mitigate the issue.

Final Update: 31/03/2026 08:53:00 AM– Microsoft has confirmed that a recent service change to enable “Sign-in experience for data sources” by default contained a code misconfiguration which resulted in timeout errors when attempting to connect to Azure Analysis Services. They have uploaded a new build to the Microsoft Download Center and Windows Store containing a fix to address this error and have confirmed with a subset of affected users that the new build remediates impact.

Scope of impact: Impact may occur for some users intermittently and users may be unable to access their Exchange Online mailboxes with the Outlook mobile apps.

Root cause: A recent service change to enable “Sign-in experience for data sources” by default contained a code misconfiguration which resulted in timeout errors when attempting to connect to Azure Analysis Services

Next steps: Microsoft are analyzing the offending service change to determine why the potential for impact wasn’t caught during our internal testing and validation stages. This analysis will help us to ensure similar impact scenarios don’t occur in the future by bolstering our internal testing procedures.