MFA & Verification Issues

How to Reset a Lost Phone Number for Microsoft MFA

Maira Mehtab Sep 27, 2026 869 views

Question details

The user has lost access to the phone number registered for Microsoft multifactor authentication (MFA) and needs to reset or update it to regain access to their account.

Product: Microsoft Entra ID / Microsoft 365
Device & OS: not provided
Scenario: A user is attempting to log into their Microsoft account but cannot complete the multifactor authentication process because the registered phone is lost.
Observed behavior: The system prompts the user to enter a verification code sent to the lost phone number, preventing the user from successfully signing in.

Before you start

Determine whether you are trying to access a personal Microsoft account or a work/school account, as the recovery methods differ significantly. For organizational accounts, you will need to know how to contact your IT administrator.

Solution 1Recommended

Contact Your IT Administrator (For Work or School Accounts)

End users in an organization cannot bypass or reset their own MFA phone number without administrative assistance.

If your account is managed by an organization (like a company or school), security policies prevent you from self-resetting a lost MFA device without a secondary method already set up. Your IT department has the tools to reset this securely.

Identify your IT support contact

Find the contact information for your organization's IT helpdesk, system administrator, or Microsoft 365 administrator.

Request an MFA reset

Explain that you have lost your authentication phone and ask them to clear your old multifactor authentication methods or require re-registration.

Set up a new method

Once the administrator clears your old number, sign in to your Microsoft account. You will be prompted to register a new phone number or set up the Microsoft Authenticator app.

Solution 2

Reset MFA Authentication Methods via Microsoft Entra Admin Center (For Administrators)

Microsoft 365 administrators can manually remove a user's lost phone number and force the account to set up a new authentication method.

Solution 3

Use Account Recovery for Personal Microsoft Accounts

If you lost the MFA phone number for a personal account (such as Outlook.com or Xbox Live), you must use Microsoft's automated recovery process.

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Frequently Asked Questions

Can I bypass Microsoft MFA if I lost my phone?

No, Microsoft strictly enforces MFA to ensure account security. You cannot bypass it. You must either contact your organization's IT administrator to reset your methods or use the official account recovery process for personal accounts.

How long does it take to recover a personal Microsoft account without the phone number?

If you do not have access to any other backup security information (like an alternate email), Microsoft's automated account recovery process can take up to 30 days. This waiting period is a security measure to prevent unauthorized access.

Can another administrator reset my MFA if the main admin is locked out?

Yes, if your organization has multiple users with global administrator or authentication administrator privileges, another admin can log into the Microsoft Entra admin center and reset your multifactor authentication methods.

Login & Account Issues