Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Some users may be unable to access https://m365.cloud.microsoft and receive an error – RESOLVED

Announcements Sharmista Mohanta

09/09/2026 09:27:00 AM

NHS.net Connect Reference: INC46930174

Microsoft Reference: MO1469271

Issue Status: RESOLVED

Issue Description: Users may be unable to access https://m365.cloud.microsoft and receive an error message.

More info: Users received a “GetSections returned no conversation history” error message.

Final Update: 09/09/2026 09:29:00 AM – Further analysis indicated that the previously referenced 400 and 503 error messages were unrelated to the issue described in this communication, and Microsoft has updated the communication accordingly. They reverted a recent service update that was intended to improve chat-loading functionality when accessing m365.cloud.microsoft and confirmed through service telemetry that the error rates have subsided and service is restored.

Scope of impact: This issue may have affected some users attempting to access https://m365.cloud.microsoft.

Root cause: A recent service update, intended to improve how chats are loaded when accessing m365.cloud.microsoft, rejected requests which resulted in https://m365.cloud.microsoft failing to load.

Next steps: Microsoft is reviewing their testing processes to determine how they can identify similar issues prior to deployment so they can resolve these issues beforehand.