Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi @kyara,
I hope you’re having a great day.
This issue occurs because your old phone number is still set as the trusted security method for Multi‑Factor Authentication (MFA). Because that number is no longer available, the verification code cannot be delivered. This is an intentional security design that prevents unauthorized users from changing authentication details and taking over accounts. In cases like this, restoring access usually involves an MFA reset.
However, as a member of the community support team, I have limited access and cannot modify MFA settings for user accounts. Since you are using a work or school email address, the MFA settings are managed by your school's IT department. For assistance with resetting or updating your MFA, you will need to contact them directly to resolve this.
Please contact your school's IT Help Desk or support team and explain the situation. Specifically ask them to “Reset my MFA settings or allow me to re-register for MFA". This is a standard request, and your school's IT team should be able to assist you with it.
You can also share the steps in this Microsoft article for them so they can help reset your MFA settings for you Manage user authentication methods for Microsoft Entra multifactor authentication.
In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support.
Once your school's admin has reset your MFA, the next time you log in to your account, you will be guided through the process of setting up the Microsoft Authenticator app again from the beginning by scanning a QR code. This will break the loop and allow you to access your account normally.
Please note that forum moderators do not have access to user account settings and cannot assist with logging in, resetting passwords, or changing access rights. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues, we’ll continue doing our best to support you within the scope of our responsibilities.
I hope this helps you regain access to your account quickly. I'm glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.
If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.
Thank you for your kindness and contributions to the forum.
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