Microsoft 365 Alert – Service Degradation – Microsoft 365 suite, Microsoft Teams, Microsoft Copilot (Microsoft 365) – Users may be unable to publish Apps in the Microsoft Teams App Store and the Microsoft Copilot Agent Store – RESOLVED

Announcements Arpan Das

21/11/2025 09:21:00 AM

NHSmail Reference: INC46687795

Microsoft Reference: MO1188691

Issue Status: RESOLVED

Issue Description: Users may be unable to publish Apps in the Microsoft Teams App Store and the Microsoft Copilot Agent Store.

Final Update: 27/11/2025 08:30:00 AM – Microsoft have identified that a recent Content Delivery Network (CDN) ingestion infrastructure configuration change had resulted in impact. To remediate this, they reverted the offending configuration change and reprocessed all previously affected apps and completed the backlog of ingestion data. After monitoring the service, they verified that the issue has been successfully resolved.

Scope of impact: Any user may be affected by this event, and the issue may impact users viewing suggested replies in Microsoft Teams. This section may be updated as our investigation continues.

Root cause: A regression with the language detection functionality for smart replies in Microsoft Teams is impacting the language for suggested replies in Microsoft.