Hi, Yuting.
Thank you for contacting the Microsoft community.
As we understand from your post, you are having trouble accessing Copilot, as an error message appears. We are happy to help!
You have contacted us through the Microsoft Credentials support forums. Please note that we can only provide support regarding your Certification Profile, and the achievement of the Certifications listed on our platform.
To receive appropriate assistance with your request, we invite you to visit: Community support with Copilot for Service, where you will find all available support options to receive support regarding queries related to Copilot.
We hope that you find this information to be helpful. If you require assistance regarding your Certification Profile, please let us know.
If your concern has been resolved, please let us know by selecting "Yes" where it says, "Did this solve your problem?" located at the lower right corner of this post. This will close the thread.
If we do not receive a response, the case will be closed and locked after one business day.
Best regards,