Hi ZENG,
Thank you for posting, I am here to help. I’m Sorry you are having this Problem.
If you’re getting an "We don't support that country code" error, this is because this feature has been disabled by your local government. Some countries also having this local restrictions.
This decision doesn’t come directly from Microsoft and that it may take some time before the issue is resolved.
We recommend to reach out to Microsoft Support to confirm whether your country is currently supported.
Please follow this steps:
Here is the link: https://support.microsoft.com/home/contact
Type this keyword and press Enter: Contact Support.
At the bottom, click "Sign in to contact support" and sign in with your personal Microsoft account, or click "Contact Support" if you're already signed in.
In Product and services, select "Windows".
In Category, select "Technical support."
Click "Chat with a support agent in your web browser".
If you ever find yourself stuck in a loop, please use the keywords "Contact Support" or "Live Chat" (without the quotes) and click "Contact Support" at the bottom.
Click "Reply" below if you have any further questions.
looking forward to helping you out. If you need more help please let me know. If the answer is helpful, please click "Accept Answer".
Best regards,
Jansher