Try these in order:
- Run the Copilot connectivity troubleshooter.
- Open Get Help.
- Search for Copilot connectivity troubleshooter.
- Follow the prompts.
- This checks for firewall rules or other blockers that can prevent Copilot from connecting.
- Remove and reinstall the Copilot app.
- In Windows 11: go to Settings > Apps > Installed apps.
- Search for Copilot.
- Select … > Uninstall.
- Reinstall it from the Microsoft Store.
- If reinstalling does not help, try signing in again after the reinstall.
- One documented sign-in fix for Copilot is to uninstall and reinstall the app, and then try signing in again.
- If the sign-in window still never opens, use Get Help results to identify blockers.
- After the troubleshooter runs, review its findings and suggested remedies.
References: