App authentication - problem w/ group management

Hi!
I am trying to manage the authentication of a group of people via the plasmic authentication app but I am having problems. I set the parameters under ‘settings’ and created the group, but when I try to enter it in the ‘permission’ tab nothing happens. It allows me to enter groups in the search field but once I press the ‘add’ button nothing happens. This does not allow me to then manage the various roles.

How can I fix this, am I doing something wrong?

Thanks!