Can't Add New Phone Number

For personal Microsoft accounts, Microsoft now says you can no longer add a phone number as a new security method. This method is being phased out. See official document here.

https://support.microsoft.com/accounts-billing/manage/microsoft-to-stop-sending-sms-codes-for-personal-accounts

Are you hoping to update the contact method to receive the 2FA verification?

If so, you go to https://account.live.com > Security > Manage how I sign in. And you will need to use email, the authentication app, or passkey.

If you need to verify your Bing Reward, The supported alternative to entering a phone number is QR-code verification through the Bing mobile app. Microsoft officially identifies this as an alternative to SMS, and users have successfully redeemed rewards with it when SMS verification failed. https://support.microsoft.com/en-us/accounts-billing/rewards/use-qr-code-verification-to-redeem-microsoft-rewards

Hi,

Microsoft has updated its account security system, and for improved account protection, phone numbers can no longer be added as a new sign-in verification method. Instead, Microsoft now recommends using a recovery email address, the Microsoft Authenticator app, or a passkey/security key as your primary methods for account security and recovery.

To manage or add your security information, please sign in using the link below:

https://account.live.com/proofs/Manage

Once signed in, click “Add another way to sign in or verify” and choose your preferred recovery method. Using the Microsoft Authenticator app or a recovery email is highly recommended because they provide stronger security and can help you recover your account more easily if you ever lose access in the future.

You can find more information in Microsoft’s official support article here:

https://support.microsoft.com/account-billing/microsoft-account-security-info-verification-codes-bf2505ca-cae5-c5b4-77d1-69d3343a5452