I want to retrieve users/ a user from an AD-group in SharePoint 2016 and show them on the permissions site under site settings. Add a custom button for this first under the permissions menu for example New, and then display all users from within that AD-group. Is this possible with client code (no back-end code if possible) and how do i proceed/start this process? The only one who should have this access to retrieve the users is the site admin. Anyone that has an idea how to do this? Thank you!