MFA & Verification Issues

How to Change the Phone Number for Microsoft 365 Two-Step Verification

John Wilson Sep 30, 2026 868 views

Question details

The user needs to update or replace the phone number associated with their Microsoft 365 two-step verification (MFA).

How to Change the Phone Number for Microsoft 365 Two-Step Verification

Product: Microsoft 365
Device & OS: not provided
Scenario: Updating account security information to maintain access and authentication after getting a new phone number.
Observed behavior: The user wants to replace an old or inaccessible phone number with a new one for two-step verification but may be blocked by organizational settings.

Before you start

Determine whether you are using a work/school account or a personal Microsoft account (like Outlook.com or Hotmail), as the process for changing your two-step verification phone number differs significantly for each.

Solution 1Recommended

Contact Your IT Administrator for Work or School Accounts

For business or education accounts, users generally cannot change the MFA phone number themselves. Your IT administrator must reset your MFA registration.

In enterprise and educational environments, security policies usually prevent end-users from modifying authentication methods independently to protect against unauthorized account takeovers.

Your organization's Microsoft 365 or IT administrator has the necessary permissions to clear your old authentication data through the Microsoft 365 admin portal.

Identify your administrator

Contact your company's IT helpdesk, your manager, or the person who initially provided your work or school email address.

Request an MFA reset

Ask the administrator to 'Require a new MFA registration' for your specific user account. This action removes the previous authentication methods.

Set up your new phone number

Once the administrator confirms the reset, sign in to your Microsoft 365 account. You will be prompted to provide more information. Follow the on-screen instructions to enter and verify your new phone number.

Contact Your IT Administrator for Work or School Accounts

Important: If you are the only administrator for your Microsoft 365 tenant and are locked out, you will need to contact Microsoft Data Protection support directly to regain access.

Solution 2

Update Security Info for Personal Microsoft Accounts

If you use a personal account (such as Outlook.com, Live.com, or Hotmail), you can manage your verification methods directly through your Microsoft account security dashboard.

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Frequently Asked Questions

Can I change my Microsoft 365 MFA phone number without admin approval?

For most work or school accounts, organizational security policies restrict users from changing MFA settings independently. You will typically need an IT administrator to initiate a new MFA registration for your account.

What happens when my administrator resets my MFA?

Once your administrator requires a new MFA registration, your previous authentication methods (like the old phone number) are cleared. The next time you sign in to Microsoft 365, you will be prompted to set up your security information from scratch, allowing you to enter your new phone number.

How do I know who my Microsoft 365 administrator is?

Your administrator is usually the person or department that set up your work or school email account. This could be your company's internal IT department, a technical support helpdesk, or an external IT service provider.

Does this admin requirement apply to my personal Outlook.com email?

No, personal Microsoft accounts (such as Outlook.com, Live.com, or Hotmail) are managed entirely by you. You can update your phone number by accessing the 'Advanced security options' in your personal Microsoft account dashboard.

Login & Account Issues