Challenge_response no EMAIL in drown list

Hi, i need ti do MFA for palo alto GP with this video tutorial :
But I don’t see EMAIL in the drop-down list challenge_response for Policies.
Thank you for help
privacyIDEA 3.9.2

How do you think an email gets triggered by default?

An EMAIL token is a challenge response token per se. You do not need this policy for EMAIL.