As an AI language model, I do not have access to Copilot's specific system or server. However, the error message "unable to verify the first certificate" usually occurs when the server's SSL/TLS certificate is not recognized or accepted by the client. This can happen if the certificate is expired, revoked or does not match the server's domain name.
To fix this issue, the server administrator may need to renew or replace the SSL/TLS certificate, ensure that the domain name matches the certificate, or verify that the chain of trust is valid. The client can also try clearing their browser's cache and cookies or using a different browser to see if it resolves the issue.