Some users may be unable to access Office.com

Title: Some users may be unable to access Office.com

User impact: Users may be unable to access Office.com

More info: Additionally, users may be unable to access m365.cloud.microsoft, which impacts Microsoft Copilot access (https://m365.cloud.microsoft/chat). Users can access Copilot through alternate methods, such as:
- Microsoft Copilot for Microsoft 365 app
- Microsoft 365 apps (including Microsoft Teams and Office Apps)

Users may need to perform a browser refresh to experience relief.

Current status: We rolled a portion of the service back to a previous client build and reverted several configuration changes. Service telemetry shows that the service availability has significantly improved for that infrastructure. Additionally, we’ve received reports from users hosted on that infrastructure that the issue no longer occurs. We're now performing the rollbacks for the remaining impacted infrastructure. Users may need perform a browser refresh to experience relief.

Scope of impact: This issue is limited to some organizations hosted within a specific section of affected infrastructure within the North America region.

Next update by: Wednesday, August 20, 2025, at 7:30 PM UTC

We've completed the revert and telemetry is showing significant improvement in availability. We're entering a period of extended monitoring to confirm resolution.

This quick update is designed to give the latest information on this issue.

We've identified a specific configuration change that started deployment at approximately the same time we received the initial reports of impact. Out of an abundance of caution, we're reverting the update as a potential mitigation strategy. Additionally, we're continuing to analyze network traces, authentication flows and Content Delivery Network (CDN) interactions to determine the root cause.

This quick update is designed to give the latest information on this issue.

Title: Some users may be unable to access Office.com

User impact: Users may be unable to access Office.com

More info: Additionally, users may be unable to access m365.cloud.microsoft, which impacts Microsoft Copilot access (https://m365.cloud.microsoft/chat). Users can access Copilot through alternate methods, such as:
- Microsoft Copilot for Microsoft 365 app
- Microsoft 365 apps (including Microsoft Teams and Office Apps)

Current status: We’ve identified errors within one of the background authentication flows, and we’re investigating this further to determine why these errors are occurring.

Scope of impact: This issue is limited to some organizations hosted within a specific section of affected infrastructure within the North America region.

Next update by: Wednesday, August 20, 2025, at 5:30 PM UTC

We're continuing to review network trace logs that were captured during a reproduction of the issue. In parallel, we're reviewing recent changes made within the service to assist our investigation.

This quick update is designed to give the latest information on this issue.

We've gathered network trace diagnostics and we're currently reviewing them to isolate the source of the issue.

This quick update is designed to give the latest information on this issue.

Title: Some users may be unable to access Office.com

User impact: Users may be unable to access Office.com

More info: Additionally, users may be unable to access m365.cloud.microsoft, which impacts Microsoft Copilot access (https://m365.cloud.microsoft/chat). Users can access Copilot through alternate methods, such as:
- Microsoft Copilot for Microsoft 365 app
- Microsoft 365 applications (including Microsoft Teams and Office Apps)

Current status: We’re continuing to review service telemetry from components that facilitate Office.com functionality. In parallel, we’re attempting to reproduce the issue internally to gather additional network diagnostics.

Scope of impact: This issue is limited to some organizations hosted within a specific section of infrastructure within the North America region.

Next update by: Wednesday, August 20, 2025, at 3:30 PM UTC

Title: Some users may be unable to access Office.com

User impact: Users may be unable to access to access Office.com

Current status: We're reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan.

Scope of impact: Impact is specific to some users attempting to access Office.com.

Next update by: Wednesday, August 20, 2025, at 3:30 PM UTC