MFA & Verification Issues

How to Change the Phone Number Associated with Microsoft Office

Maira Mehtab Sep 20, 2026 870 views

Question details

The user needs to update the phone number associated with their Microsoft Office account for identity verification or multi-factor authentication (MFA).

Product: Microsoft Office / Microsoft Account
Device & OS: not provided
Scenario: Updating account security and recovery information to ensure continuous access to Microsoft Office services.
Observed behavior: The user wants to successfully replace an outdated or incorrect verification phone number with a new, active phone number.

Before you start

Verify whether your Microsoft Office license is tied to a personal Microsoft account or an organizational (work or school) account, as the process for updating security information differs significantly.

Solution 1Recommended

Update Phone Number for a Personal Microsoft Account

Use this method if you subscribe to Microsoft 365 Family/Personal or use a free, personal Microsoft account.

Personal Microsoft accounts allow you to directly manage your security info, including phone numbers and alternative email addresses, through the Microsoft account management portal.

Access account security settings

Go to the Microsoft account website and sign in. Navigate to the 'Security' tab and select 'Advanced security options'.

Add a new way to sign in or verify

Click on 'Add a new way to sign in or verify' and select 'Show more options' if necessary. Choose the option to add a phone number.

Verify the new number

Enter your new phone number and input the verification code sent via SMS to confirm it.

Remove the old number

Once the new number is verified, locate your old phone number in the security list, click 'Remove', and confirm the deletion.

30-Day Waiting Period: If you remove all of your old security information at once, Microsoft may impose a 30-day restriction on updating security info to protect against unauthorized account takeover.

Solution 2

Update Phone Number for a Work or School Account

Use this method if your Office license is managed by an organization, employer, or educational institution.

Solution 3

Use the Microsoft Account Recovery Process

Follow these steps if you have completely lost access to the old phone number and cannot log in to access your security settings.

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Frequently Asked Questions

Why can't I change the phone number on my work account?

Work and school accounts are managed by organizational administrators via Microsoft Entra ID. For security reasons, many organizations disable the ability for end-users to change their multi-factor authentication (MFA) details themselves. You must contact your IT department to make the change.

What happens if I lose access to my old phone number before adding a new one?

If you lose access to your old number and do not have an alternative verification method (like an authenticator app or secondary email), you will need to go through the Microsoft account recovery process, which can take up to 30 days to complete.

Can I use the same phone number for multiple Microsoft accounts?

Yes, Microsoft generally allows you to use the same phone number for verification across different accounts. However, if the system detects the number being added to too many accounts in a short period, it may temporarily block the action to prevent spam.

Login & Account Issues