MFA & Verification Issues

How to Change the Phone Number for Microsoft Verification Codes

Maira Mehtab Sep 21, 2026 868 views

Question details

The user wants to update the phone number associated with their Microsoft account used for receiving multi-factor authentication (MFA) verification codes.

Product: Microsoft Account
Device & OS: not provided
Scenario: Updating security information and verification methods for an existing Microsoft account.
Observed behavior: The user needs to switch their MFA verification method to a new phone number for either a personal or organization-managed account.

Before you start

Ensure you have access to your current Microsoft account password and, if possible, your old verification method or secondary email to authorize the security changes.

Solution 1Recommended

Update Phone Number for Personal Microsoft Accounts

If you are using a personal Microsoft account, you can update your phone number directly through your account's security dashboard.

Personal Microsoft accounts allow you to self-manage your security information. It is highly recommended to add the new phone number before removing the old one to avoid being locked out of your account.

Access Security Settings

Sign in to your Microsoft account on the official website and navigate to the 'Security' tab at the top of the dashboard.

Open Advanced Security Options

Click on 'Advanced security options' or 'Security info' to view your current verification methods.

Add a New Sign-in Method

Under the 'Ways to prove who you are' section, click 'Add a new way to sign in or verify'. Choose 'Text a code' from the available options.

Verify the New Number

Enter your new phone number and confirm it using the verification code sent to you via SMS. Once verified, you can select 'Remove' next to your old phone number.

Solution 2

Update Phone Number for Work or School Accounts

If your account is managed by an organization, you may have limited permissions and might need to manage settings through the Microsoft 365 My Sign-Ins portal or contact your IT administrator.

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Frequently Asked Questions

Why can't I access my Microsoft security settings to change my number?

If you don't have access to your old phone number or an alternative recovery email, Microsoft may require you to fill out an account recovery form. This process often enforces a 30-day waiting period to protect your account from unauthorized changes.

Can I use the Microsoft Authenticator app instead of a phone number?

Yes. In your security settings under 'Ways to prove who you are', you can choose to 'Add a new way to sign in or verify'. Select the option to add an app and follow the prompts to link the Microsoft Authenticator app for push notifications or time-based codes.

What should I do if I lose the phone registered for my work account?

You must contact your company's IT department or Microsoft 365 administrator immediately. They can revoke the old device's MFA tokens from the admin center, temporarily bypass the requirement, and allow you to register a new phone number or authentication app.

Login & Account Issues