I have not, but thanks for the suggestion. I don't have much experience here, but I was under the impression that Active Directory was for Windows networks.
A detail I didn't include in my original post is that the primary devices used are Android tablets & phones. I don't know much about ldap in the mobile context (or in general, to be honest).
although active directory is installed on windows, many library allow to use it as a source of truth for authentication. But of course your apps need to be compatible with it (and if you don't want to install AD any other LDAP would work too if the apps are compatible).
