Building and customizing solutions using Microsoft 365 Copilot APIs and tools
Try these steps in order:
- Restart the app or refresh the web page. On Mac, quit Copilot completely and reopen it. In the browser, refresh the page.
- Check that the same account is signed in everywhere. If content or behavior differs between devices, confirm the same personal Microsoft account, Google sign-in, or Apple sign-in is being used consistently.
- Enable third-party cookies in the browser. For Copilot web apps:
- Chrome: Settings > Privacy and security > ensure Allow third-party cookies is selected.
- Safari on macOS: Safari > Settings... > Privacy tab > ensure Prevent cross-site tracking is unchecked. Then open Advanced and ensure Allow-privacy-preserving measurement of ad effectiveness and Block all cookies are unchecked.
- Try again later. Some Copilot issues are temporary service-side capacity or backend problems. One documented response is: “Sorry, Copilot is at capacity and temporarily unavailable — please try again in a little while.”
- If using Dynamics 365 Sales Copilot, check admin configuration. Common causes include a failed initial publish of the Copilot agent or data loss prevention policies blocking Microsoft Dataverse or Direct Line channels in Copilot Studio.
- If the problem continues:
- Home users: contact Support.
- Business users: check with the Microsoft 365 admin to confirm Copilot is assigned correctly, and the admin can contact Microsoft support if needed.