Which Two-Factor method is NOT an option in the Default Authentication Profile?

In the Default Authentication Profile for a Secure Email Gateway, the two-factor method that is not included is phone call verification. The focus of two-factor authentication is to enhance security by requiring two forms of verification, typically something the user knows (like a password) and something the user has (like a mobile device).

The options that are part of the Default Authentication Profile include methods like SMS verification, mobile app notifications, and email verification, which all utilize different ways of sending information to the user. Although phone calls can be used for two-factor authentication in some contexts, within the specific parameters of the Default Authentication Profile, it is not designated as a supported method. This highlights a design choice aimed at balancing user convenience against security mechanisms, ensuring that the included methods are both effective and widely deployable.