How to change my phone number

Wright Nina 20 Reputation points
2026-08-12T04:08:00.5333333+00:00

Hello

I can't change my phone number, they send me the verification code on the old phone number.

Outlook | Web | Outlook on the web for business | Settings
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Answer accepted by question author
BabybooHN 2,785 Reputation points Independent Advisor
2026-08-12T04:28:53.4866667+00:00

Dear @Wright Nina,

If this is a Microsoft 365 work or school account, the phone number used for verification is usually managed through your organization's Security Info settings (Microsoft Entra ID).

I recommend the following:

  1. Sign in to https://mysignins.microsoft.com/security-info
  2. If you can still access another verification method (Microsoft Authenticator, alternate phone, or email), use it to sign in.
  3. Select Add sign-in method and add your new phone number.
  4. Once the new method is verified, remove the old phone number. User's image

If the system only offers your old phone number and you no longer have access to it, you will need to contact your organization's Microsoft 365 administrator or IT Help Desk. Administrators can reset your MFA (Multi-Factor Authentication) methods and require you to register new security information at your next sign-in. Please refer to this document: Sign in to your work or school account using two-step verification

Unfortunately, neither Microsoft Support nor forum advisors can update MFA details for a business account because these settings are controlled by the tenant administrator. Users typically need an alternative authentication method or administrator assistance to regain access. For official steps your administrator can follow, please refer to Microsoft's documentation on Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID

Please let me know if you need any further assistance.

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  1. AI answer

    2026-08-12T04:08:17.34+00:00

    If this is a personal Microsoft account, update the phone number in the account aliases/security info:

    1. Go to Edit account info at https://account.live.com/names/manage and sign in.
    2. Select Add phone number.
    3. Verify the new number.
    4. Make the new number the primary alias if needed.
    5. Remove the old number after the new one is added.

    If the sign-in flow is still sending codes to the old number:

    1. On the sign-in page, choose another verification method if one is available.
    2. Check whether the code can be sent to your primary alias or another email already added for sign-in verification.
    3. If the old number is the only method and there is no alternate method, use the account recovery path and add new security info when prompted.

    Important details:

    • Verification codes sent by email can only go to your primary alias or another email already added as a sign-in verification method.
    • VOIP numbers cannot be added for sign-in or verification codes. Use a mobile phone number.
    • If codes are not arriving, avoid repeated requests because unusual activity can temporarily block code delivery.
    • For a work or school account, update the number on the Security info page by removing the old phone method and adding the new one.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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