MFA & Verification Issues

How to Update Microsoft 365 Work Account Phone Number When MFA is Unavailable

Maira Mehtab Sep 27, 2026 869 views

Question details

The user needs to change the security phone number associated with their Microsoft work account but cannot access the currently configured Multi-Factor Authentication (MFA) method.

Product: Microsoft 365
Device & OS: not provided
Scenario: Updating account security information when the primary authentication device or phone number is lost, changed, or otherwise unavailable.
Observed behavior: The system blocks the user from updating the phone number because verifying the change requires access to the existing, inaccessible MFA method.

Before you start

Determine whether you are a standard user or the primary tenant administrator for your Microsoft 365 organization, as the recovery steps depend entirely on your role.

Solution 1Recommended

Request an MFA Reset from Your Microsoft 365 Tenant Administrator

Standard users must contact their organization's IT department or Microsoft 365 administrator to clear the old MFA settings and allow a new phone number to be registered.

Because work accounts are managed by an organization, standard users cannot bypass MFA prompts on their own for security reasons. An administrator has the authority to require re-registration of your security info.

Contact your IT administrator

Reach out to your organization's helpdesk or the Microsoft 365 tenant administrator.

Admin action in Entra admin center

Ask the administrator to sign in to the Microsoft Entra admin center (formerly Azure AD) and navigate to 'Users' > 'All users'.

Select your account

The admin must select your user profile and go to the 'Authentication methods' section.

Require re-register MFA

The admin should click 'Require re-register MFA'. Upon your next login, you will be prompted to set up your new phone number from scratch.

For Global Administrators: If you are an administrator trying to reset a user's MFA, ensure you verify the user's identity through an alternative channel before clearing their authentication methods.

Solution 2

Contact Microsoft Business Support (For Sole Administrators)

If you are the only administrator for the tenant and have lost access to your MFA method, you must contact Microsoft support directly to recover your account.

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Frequently Asked Questions

Can I bypass MFA to change my Microsoft work account phone number?

No. For security reasons, Microsoft requires you to authenticate with your existing MFA method to change your security settings. If it is unavailable, your organization's IT administrator must reset it for you.

What happens if I am the only admin and lose my MFA device?

If you are the sole global administrator and lose your MFA access, you must contact Microsoft Business Support by phone. Their Data Protection team will guide you through a manual identity verification process to recover your tenant.

Can I use a personal Microsoft account recovery method for a work account?

No, work and school accounts are managed by your organization's tenant and follow completely different security protocols. You cannot use personal account recovery forms or alternate emails unless they were specifically pre-configured in your organization's self-service password reset (SSPR) portal.

How long does it take for Microsoft Support to recover a locked admin account?

Account recovery for tenant administrators through the Microsoft Data Protection team can take anywhere from a few days to a few weeks, as it requires rigorous security checks to prevent unauthorized access to corporate data.

Login & Account Issues