Internal and external user


I would like to inquiry somethin on below use case
Due to I have 2 group of users , internal and external users.
Internal user is on AD , external is on their app.

So what I try to do is let the auth0 integrate to AD via LDAP
but for external user , I would use the auth0 user management function for maintenance this group of user.

So any application even internal or external user can do SSO via auth0 , is my assumption correct ?