Authentication for log in

Question

My phone number changed how do I get past the authentication?

Answer 1

If this is a work or school account, there are two supported paths:

1. Try updating the method yourself at My Sign Ins | Security info: https://mysignins.microsoft.com/security-info
   • Sign in with the account.
   • Select the old Phone number method and change it, or add a new sign-in method.
   • Verify the new number.
2. If sign-in is blocked because verification is still going to the old number, contact the organization’s IT admin.
   • An admin can go to Microsoft Entra admin center > Entra ID > Users > select the user > Authentication methods.
   • The admin can add or change the phone number there.
   • If needed, another admin can reset the MFA contact methods so the account is prompted to register them again at next sign-in.

If this is a personal Microsoft account:

1. Go to the Microsoft account Security page: https://account.microsoft.com/security
2. Select Manage how I sign in.
3. Select Add a new way to sign in or verify.
4. Add a new method such as a recovery email, Microsoft Authenticator, passkey, or phone option if available.

If the old phone number is the only method available during sign-in, select I don't have any of these and follow the prompts to recover the account and add new security info.

For personal accounts, the option to add a new phone number may not be available, because SMS is being phased out for some Microsoft accounts.

---

References:

• Manage user authentication methods for Microsoft Entra multifactor authentication
• Can't use Azure Multi-Factor Authentication to sign in to cloud services after you lose your phone or the phone number changes
• Use a screen reader to set up and troubleshoot multifactor authentication
• Microsoft account security info & verification codes
• Common problems with two-step verification for a work or school account
• Microsoft to stop sending SMS codes for personal accounts