Hi Parthib Deb
Welcome to Microsoft Q&A Forum, thank you for posting your query here!
I understand that you are encountering an issue, you can use GitHub student account or personal Gmail for registration then do the verification with education email address. You can reach your college admin if they have not allowed student emails for Azure Account registration yet. Alternatively, you can opt for a trial account with personal email if you domain in not eligible for Student subscription and use the free quota for limited period (30 Days and eligible free quota for 12 months for other services) free-services
please refer this thread: https://learn.microsoft.com/en-us/answers/questions/540273/your-email-domain-is-not-currently-registered-with?form=MG0AV3
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