Membership 2 Pro registration using Gravity Forms

We are trying to set up detailed registration pages for our site using Membership 2 Pro and Gravity Forms. I have added the line to my functions.php file as per the instructions as well as selected the registration page with the Gravity Form on it in the Membership 2 Pro settings, however, when the form is submitted, nothing happens other than the form showing up as a new Gravity Forms entry. How can we make it populate under All Members in Membership 2 Pro?