How do i update a new phone number in the authentication app?

brahim jalifi 0 Reputation points
2025-12-17T22:07:18.3733333+00:00

How do I update a phone number for the 2 step authentication?

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  1. Jade Ng 15,310 Reputation points Microsoft External Staff Moderator
    2025-12-18T00:12:55.2733333+00:00

    Dear @brahim jalifi,

    Good day. Thank you for posting your question in the Microsoft Q&A forum!

    I found these steps from Q&A Assist quite helpful, and I recommend you try it and check if it helps.

    You can add or edit your own authentication methods in My Sign Ins | Security info. For example, to change the phone number, select Phone number and tap Change.

    Untitled

    Additionally, you can contact your IT admin to add or change authentication methods for you in the Microsoft Entra admin center.

    Please refer to: Manage user authentication methods for Microsoft Entra multifactor authentication

    If you’re unsure who the Global Admin is within your organization, you can find guidance on locating them here: How do I find my Microsoft 365 admin? - Microsoft Support.    

    Please feel free to reply below if you have any update or further concern. 

    Your understanding and co-operation are highly appreciated. Thank you for your precious time. Have a nice day!

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  2. AI answer

    2025-12-17T22:07:28.4166667+00:00

    To update a phone number for two-step authentication in Microsoft Entra ID, you can follow these steps:

    1. Sign in to the Microsoft Entra admin center as at least an Authentication Administrator.
    2. Navigate to Entra ID > Users.
    3. Select the user for whom you want to update the phone number and go to Authentication methods.
    4. At the top of the window, select + Add authentication method.
    5. Choose Phone number from the method options.
    6. Enter the new phone number, including the country code, and select the appropriate phone type (Mobile, Alternate mobile, or Other).
    7. Click Add to save the changes.

    Users can also update their own authentication methods by going to My Sign Ins | Security info and selecting the phone number option to change it.

    Make sure that the phone number is unique within your tenant, as using the same phone number for multiple users will result in an error.

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

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    1 person found this answer helpful.

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