As PM for IAM, I’d like to clarify that we’re aiming to get a platform supported version of the LDAP module released in Q4 ‘22.
This version will support Mx9 onwards.
We initially wanted to use LDAP but saw it was going to be deprecated. WE used the SAML module Mendix Marketplace - SAML
Find the docs here SAML | Mendix Documentation
On provisioning: https://docs.mendix.com/appstore/modules/saml/#323-user-provisioning
Does this not meet your needs? You can create and provision users on the fly.