HI @Damian A. Rivas ,
Welcome to Q&A forum!
You can set it in Microsoft Entra admin center.
Expand Protection and click Authentication methods
. On the right, you can see the authentication methods you already have. If you already have phone authentication, you can choose to enable it. The administrator does not need a different license to set this up.
For your reference:
https://learn.microsoft.com/en-us/entra/identity/authentication/concept-authentication-phone-options
End users can perform verification settings according to the following articles.
Good day!
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