Hello Steven,
Thanks for your question.
You can sign up for Azure for Student using your student academic email address or via registration for a GitHub student pack account which will give you access to a Azure for Student Verification Code if you do not have a valid student email address.
Please refer to the Microsoft for Students FAQ over here: https://azure.microsoft.com/en-us/free/free-account-students-faq/
Can you alternatively try global Support? The best bet here is to reach out to support:
See reference issue here: https://learn.microsoft.com/en-us/answers/questions/1663187/academic-verification-failure-for-azure-student-be
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola