Microsoft Investigates Teams Assignment Errors After Failed Update

Microsoft has initiated an urgent investigation into widespread disruptions impacting assignment management within its Teams platform.

Users of Microsoft Teams are encountering error messages when trying to open, set, or delete assignments. The issue stems from a recent backend change that failed to complete properly, leading to service interruptions.

Administrators are directed to the Microsoft 365 admin center (incident ID TM1230627) for updates and timelines.

This outage primarily affects core educational and productivity features within Teams, including Assignments, Classroom, and Grades apps. Reports indicate the problem spans desktop, web, and mobile clients, with errors like “There was a problem reaching this app” appearing across multiple users and organizations.

While not universal, it disrupts teachers and students relying on Teams for Education, echoing prior incidents like TM1185134 that hit European admins.

Microsoft attributes the disruption to an incomplete service update aimed at optimizing content retrieval for Assignments and related tabs.

This regression mirrors past Teams issues, such as feature updates causing client unresponsiveness or group creation failures. Engineers have identified the faulty deployment and are redeploying it correctly while probing deeper.

The company is actively restarting affected backend components to restore functionality. Initial fixes involve validating the redeployment, with service health dashboards in the admin center providing real-time status.

Past resolutions, like those for TM1197326 on channel creation, involved infrastructure monitoring and ownership handovers as workarounds. Microsoft promises further updates via TM1230627, potentially by the next business day.

Affected users should check the admin center first and avoid repeated attempts to prevent cache buildup. Clearing Teams cache via %appdata%MicrosoftTeams on Windows or ~/Library/Application Support/Microsoft/Teams on Mac offers temporary relief.

Switching to the web version or signing out/in may help, though full recovery awaits the fix. IT admins are urged to report via Health > Service Health if not already tracked.

This incident underscores recurring Teams vulnerabilities from rapid update cycles, as seen in Windows Update KB5003169 conflicts or TPM errors. With Teams integral to hybrid work and education, such outages amplify calls for robust pre-deployment testing.

Microsoft continues monitoring post-fix to prevent repeats, per standard protocol. As of February 11, 2026, no ETA for full resolution is public, but progress is underway.

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