Hi there! I see you're encountering the error message that the server "co-m.deliveroo.com" requires a client certificate when using the Deliveroo app on Windows 10. Let’s get this sorted out together.

To start off, can you tell me a bit more about how you’re accessing Deliveroo? Are you using the Windows 10 app or through a web browser? Also, is this a recent issue that started suddenly, or has it been ongoing?

In the meantime, here are some steps we can try to resolve this client certificate issue:

1. Clear Cache and Cookies (if using a browser): Sometimes cached data or cookies can cause authentication problems.
- Open your browser’s settings and clear browsing data related to cache and cookies, then restart the browser and try again.

2. Check for App or System Updates:
- If using the Deliveroo app (desktop or via the Windows Store), ensure that it is updated to the latest version.
- Also, check for Windows Updates (Settings > Update & Security > Windows Update) and install any pending updates.

3. Network or VPN Check:
- Sometimes enterprise or public networks, or VPNs, might interfere with certificate authentication. Try connecting via a different network or disconnect VPN if applicable.

4. Date and Time Settings:
- Incorrect date/time on your PC can cause certificate errors. Verify your system clock is set correctly (Settings > Time & Language).

5. Reinstall the Deliveroo app:
- If you’re using the app and it’s still not working, uninstall and reinstall it. This can reset underlying certificate configurations.

If the problem persists, it could be a server-side or certificate deployment issue on Deliveroo’s end, which may need their technical team’s intervention.

Please let me know what you find or if you run into any issues performing those steps. I’m here to help you through this! Are you accessing Deliveroo through the app or browser?