Hi Thisul Dilmith Wickramarachchi
Welcome to Microsoft Q&A forum and thank you for your question
First, please kindly wait 24 hours before attempting the alternative verification again and please not that it must be a complete 24 hours, not simply until “next day” to ensure any cooldowns expire.
After 24 hours, please kindly try again. You can also try using Upload documentary proof, instead of the other methods. If you ever received a false error message, the human review process may be more reliable. Please click the link for “Use a different method” and then click the link for “Upload documentary proof
Note: Kindly enter their personal (non-EDU) email address, not your school email in the Profile section - email address.
Thank you for your understanding and please let me know if you need any further assistance