We have our Moodle site behind an authentication proxy, which utilizes SSO/LDAP on the backend. Because of the proxy, the Moodle Mobile app can't get to the server itself without jumping through some hoops. My question is this: what endpoint(s) should I make available through the proxy in order to allow our students to use the Moodle Mobile app? We are running Moodle 3.3.3+.
Moodle for mobile
Problem using Moodle Mobile with Moodle behind an authentication proxy
what is happening when you try to connect to your site? are you able to reach the credentials (username/password) screen or you don't even get to that page?
When you are using SSO/LDAP you should set-up your Moodle app to force authentication via the app, see https://docs.moodle.org/34/en/Moodle_Mobile_guide_for_admins