Sorry for the inconvenience this must have caused.
It seems the issue with your account verification/validation. Azure subscription management team should be able to help you further in this matter. Please file a subscription support request at no extra cost to get this routed to the appropriate team.
Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
Similar issue for reference - https://learn.microsoft.com/en-us/answers/questions/64052/index.html
You can also post your question on Microsoft Training Support Forum here: https://trainingsupport.microsoft.com/en-us/mcp/forum/all/unable-to-verify-my-student-account/ff2bcadf-eabc-42b3-a52a-a8c64de6797e