The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.

https://vercel.com/docs/projects/domains/troubleshooting

You can also use v0 to narrow down the possibilities.

Hey @thuan2172001! Please open a case with the customer success team

They'll be able to help you with all the account and billing details related to domain renewal

Thank you for your support. Everything is okay now.