Microsoft is investigating a disruption affecting Microsoft 365 Copilot, where users might encounter difficulties opening the assistant or experiencing errors while using it. In an X status update, Microsoft 365 Status reported investigating an issue where users may not be able to access or encounter problems while interacting with Copilot. The backend fault can manifest as sign-in failures, empty replies, stalled prompts, or missing Copilot controls within typical apps like Word, Excel, PowerPoint, Outlook, Teams, and the Copilot chat experience integrated into these applications.
Organizations using Copilot for meeting summaries, email drafts, file management, or analyst workflows should instruct staff to revert to native Microsoft 365 apps and avoid widespread client changes that might obscure whether the cloud service has recovered.
Microsoft has not labeled CP1470554 as a breach or cyberattack, so security teams should monitor the advisory rather than open incident-response playbooks for account takeover unless they see separate identity alerts. A late-August Microsoft 365 outage related to a core authentication configuration also caused Copilot prompts to fail, such as email content, which required grounding in Microsoft 365. Learn 7 Metric-Gated AI SOC Deployment Phases – Download Free AI SOC Deployment Playbook 2026.
