Hi @huadai liu , Thanks for using Microsoft Q&A Platform.
Sorry to hear that you're having trouble with your student email address Please refer to the Microsoft for Students FAQ over here: https://azure.microsoft.com/en-us/free/free-account-students-faq/
Please visit troubleshooting documentation if that helps: https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/troubleshoot-sign-in-issue
If you're eligible for a support plan, then I suggest you create a support request over here: https://azure.microsoft.com/en-us/support/create-ticket/. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
If you cannot do the above, you can contact the Azure Support over here:
https://twitter.com/AzureSupport
I hope this helps.
Regards,
Vasavi
-Please kindly accept the answer if you feel helpful to support the community, thanks.