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Some users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications

Microsoft Copilot (Microsoft 365) CP1528503

Some users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications.

Status
Service restored
Feature
General
Region
Asia Pacific
Started
Oct 28, 2026, 08:38 CET
Resolved
Oct 28, 2026, 10:26 CET
Duration
1 h 47 min

More info

Affected applications included Outlook on the web, Outlook desktop, and Microsoft Teams desktop.

Scope of impact

Impact was specific to some users in South India and Singapore attempting to access Microsoft Copilot across multiple Microsoft 365 applications.

Root cause

A section of networking infrastructure, responsible for facilitating Microsoft Copilot access in multiple Microsoft 365 applications, became unresponsive and resulted in impact.

Next steps: - We're investigating the underlying cause of the service infrastructure instability to help prevent similar impact from recurring.

This is the final update for this event.

Final status

We've identified that a section of networking infrastructure, responsible for facilitating Microsoft Copilot access in multiple Microsoft 365 applications, became unresponsive and resulted in impact. While we were in process of developing a fix to apply performance and traffic optimizations, service telemetry indicated that the infrastructure had recovered and we'll monitor system logs to ensure that impact doesn't reoccur.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Oct 28, 2026, 10:29 CET

    We've identified that a section of networking infrastructure, responsible for facilitating Microsoft Copilot access in multiple Microsoft 365 applications, became unresponsive and resulted in impact. While we were in process of developing a fix to apply performance and traffic optimizations, service telemetry indicated that the infrastructure had recovered and we'll monitor system logs to ensure that impact doesn't reoccur.

  2. Oct 28, 2026, 08:41 CET

    We’re reviewing service telemetry and system logs to isolate the root cause, in order to develop a remediation plan.

When Microsoft 365 goes down

The live overview shows the current state of every Microsoft 365 service, refreshed every minute from Microsoft Graph.

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To see whether your own tenant is affected, check Service health in the Microsoft 365 admin center. Only a backup outside Microsoft protects against data loss, and only a tested break-glass account against locked-out admins. We set up both in fixed-scope sprints.

Source: Microsoft Graph, Service Communications API. This is the view of a Swiss Microsoft 365 tenant: services not licensed there are missing, and individual issues may affect your tenant differently. Microsoft names the region only in the issue text. The Switzerland view shows issues for Switzerland, for Europe in general and those without a region, but not issues that only name other countries such as Germany or the UK. This page is not provided by Microsoft.