The admin email on the password/pin screen is by default associated with AdobeSign account and cannot be changed. This admin email address should be configurable to be set to a customer support email address. It is not helpful that we cannot change this email address.

This is on the page "This document is password protected: You will need a password to access this document. If you do not have the password, you will need to contact <Name of admin><link to associated email>."