Active Directory has a feature called Realm Trust, which allows AD to trust an external Kerberos realm for purposes of authentication.
So, does Auth0 offer a service that presents a Kerberos domain controller?
Or ,does Auth0 offer some other service that will get me to the same place, i.e. where AD will trust Auth0 (directly or indirectly) to authenticate a user?
I think the answer is no, and I think this is an unpopular scenario, but I had to ask.