Microsoft Covers Co-Pilot Crash: Traffic Surge Sparks European Outage

Microsoft is actively working to resolve a major service incident that has been blocking users across the United Kingdom and Europe from accessing its AI-powered Copilot digital assistant, or causing severe degradation in its functionality.

The outage, which impacted Copilot’s availability within the Edge browser and across Microsoft 365 apps, was initially traced to a failure in the system’s ability to handle an unexpected surge in traffic, resulting in a capacity scaling issue. Microsoft’s engineers began manually increasing the system capacity to restore service availability. However, during the mitigation process, the company identified a separate issue, a load-balancing problem, which was further compounding the overall impact on the service, requiring additional changes to the load-balancing rules and targeted restarts of the affected infrastructure to divert traffic to healthier components.

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This means many users are currently seeing errors like, “Sorry, I wasn’t able to respond to that.” The company is simultaneously tracking a distinct incident affecting some admins attempting to access features within Microsoft Defender for Endpoint.

Ultimately, Microsoft identified that a recent traffic balancing policy change had caused a dependent portion of service infrastructure to become imbalanced, and reverting this change successfully resolved the impact, returning service health to pre-incident levels.