Since the documentation says this:
The Firepower System does not support trusted AD domains. This means that the Firepower System does not track which configured domains trust each other, and does not know which domains are parent or child domains of each other. The Firepower System also has not been tested to assure support for environments that use cross-domain trust, even when the trust relationship is exercised outside of the Firepower System.
Can I add an additional Domain/forest to the FMC? I have a cross forest trust but it seems like the FMC wont know about users in the other domain.
