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More info: Impact includes, but may not be limited to, the below services and scenarios. We will update this list as our understanding of the issue progresses.   Microsoft 365 Copilot: - Users' Copilot prompts that require Microsoft 365 grounding, such as email content, may fail. Current status: We're observing residual impact to some downstream scenarios, including search. We're incrementally restarting corresponding instances of infrastructure to ensure our previously applied authentication components are fully saturated, and we're working to identify whether any additional actions are required to achieve resolution. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. Start time: Monday, August 31, 2026, at 3:08 PM UTC Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. Next update by: Tuesday, September 1, 2026, at 4:00 AM UTC