Microsoft 365 Alert – Service Degradation – Microsoft 365 for the web – Users may be intermittently unable to access documents hosted in China using Microsoft 365 for the web – RESOLVED

20/08/2025 08:40:00 AM

NHSmail Reference: INC46608507

Microsoft Reference: OO1138109

Issue Status: RESOLVED

Issue Description: Users may be intermittently unable to access documents hosted in China using Microsoft 365 for the web.

Final Update: 20/08/2025 08:40:00 AM – Microsoft’s investigation indicates that the components of Microsoft 365 for the web infrastructure responsible for facilitating document access in the impacted regions encountered an error that prevented access to the affected documents, leading to impact. While they were in the process of analyzing these components to isolate the origin of this error, their system monitoring indicated that the service had returned to normal health. They’ve confirmed that the issue is no longer occurring, and they’ll continue to monitor the service to ensure that the problem doesn’t happen again.

Scope of impact: Any user accessing documents hosted in China using Microsoft 365 for the web may have been intermittently impacted.

Root cause: The components of Microsoft 365 for the web infrastructure responsible for facilitating document access in the impacted region encountered an error that prevented access to the affected documents, leading to impact.

Next update by: Microsoft are continuing their investigation into the infrastructure error that led to impact to more precisely determine what went wrong and reinforce their services against similar future issues.