Mendix also has a very well maintained SAML module. OAuth support has been added by the community. These are the usual ways that a user is authenticated against an AD. For more uncommon scenario’s, there is also the Kerberos module, which doesn’t have Mendix support either. As far as I am aware, there is currently no support for OpenID.
Check out the appstore: https://appstore.home.mendix.com/link/app/24/Mendix/LDAP-Synchronization-module
There is documentation in there on how to use this module.