can i have my school email back?

Note: Since you are using English, although the site locale is nl-nl, I will response to this question in English. This response has been translated using the translation tool; Please forgive me for any grammatical or semantic errors. Thank you for your understanding. If there is anything unclear about my reply, please leave a comment and I will get back to you as soon as possible.

Dear @burak l.k,

Thank you for posting your question in the Microsoft Q&A forum.

Based on your description, you are unable to access your school account because you changed your phone number and no longer can complete the account verification process.

If this is a school account, the account is managed by your school's IT administrator. In this situation, as a moderator I do not have access to reset MFA methods or recover the account on your behalf. I recommend you contact to your IT team or Helpdesk may be able to reset your Multi-Factor Authentication (MFA) settings. Only your IT team has the ability to adjust or reset your MFA configuration. You can also refer to this Microsoft support article for more information: Manage authentication methods - Microsoft Entra ID | Microsoft Learn  

I hope information above meet your expectations, please feel free to reach out if you have any other questions.

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