After setting up Adaptive Multifactor Authentication (MFA), there is a new assessor called PhoneNumber Assessment, which appears to only return the following assessment during a normal username/password login transaction. The phone assessment looks like the following:
 

"PhoneNumber": {
"confidence": "neutral",
"code": "phone_number_not_provided"
}

This article explains whether this new assessor impacts how Adaptive MFA functions for regular user logins that do not involve a phone number and whether Adaptive MFA will review the phone numbers input for Phone Message MFA and deliver a confidence score.

• Adaptive Multifactor Authentication (MFA)
• Assessors

The new "PhoneNumber assessment" is used in the login flow where the phone number is the main identifier of the user, such as the SMS Passwordless connection.

In a standard username/password login flow, the assessment result is expected to be phone_number_not_provided. Additionally, Adaptive MFA's Phone Number Assessment will only evaluate SMS Passwordless authentication at this time; the phone number input for SMS/Phone Message MFA is not evaluated by Adaptive MFA.

If this additional functionality would be useful, please consider opening a Feature Request on the Auth0 Community site which is regularly reviewed by the Auth0 Product Team.