MFA & Verification Issues

How to Change a Lost Phone Number for School Account MFA

Kushani Nimanthika Sep 28, 2026 869 views

Question details

The user is unable to sign in to their Microsoft 365 education account because the phone number used for two-factor authentication is no longer accessible.

How to Change a Lost Phone Number for School Account MFA

Product: Microsoft 365
Device & OS: not provided
Scenario: Attempting to log into a school or university portal but blocked by a multi-factor authentication (MFA) prompt sent to an unavailable device.
Observed behavior: The sign-in process halts at the verification step, preventing the user from accessing school emails, documents, or Microsoft services because the code is sent to a lost or changed phone number.

Before you start

Prepare your student or staff ID card, as the school's IT support team will need to verify your identity before making changes to your account security settings.

Solution 1Recommended

Contact the School IT Administrator to Reset MFA

Since school accounts are centrally managed, you cannot bypass MFA on your own. You must contact an authorized administrator to reset your authentication methods.

For education accounts, security settings are strictly controlled by the school's Microsoft 365 administrators. When a registered authentication method is lost, an administrator must use the Microsoft Entra admin center to clear the old phone number and trigger a new registration prompt.

Locate IT Helpdesk Contact Info

Go to your school or university's official website and search for the 'IT Support' or 'Helpdesk' page to find their phone number or support email.

Request an MFA Reset

Contact the IT department and clearly state that you have lost access to the phone number used for your Microsoft 365 two-factor authentication and need your authentication methods reset.

Re-register Your Verification Method

Once the administrator confirms they have removed the old method, go to the Microsoft 365 login page and enter your credentials. You will be prompted to set up a new phone number or Microsoft Authenticator app.

Contact the School IT Administrator to Reset MFA

Identity Verification: Administrators usually require proof of identity before modifying security information. Be prepared to provide your student ID number or answer security questions.

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Frequently Asked Questions

Can I bypass the MFA verification if I lost my phone?

No. For security reasons, Microsoft 365 education accounts do not allow users to bypass two-factor authentication. You must have an administrator reset your settings.

How do I find out who my Microsoft 365 administrator is?

For students and staff, the administrator is typically the school's technical support team or the university's IT helpdesk. Check your school's website directory for 'IT Support'.

Can I add a new phone number if I still have the Microsoft Authenticator app?

Yes. If you can still approve the sign-in using the Microsoft Authenticator app or an alternate email, log into your account, navigate to 'Security info' in your profile settings, and add the new phone number.

Login & Account Issues