Is it possible to configure multiple Active Directory in a Single Tableau Server?
No. Tableau Server will "trust" only a single domain:
Domain Trust Requirements
However, you can configure the domains to trust each other (via one-way or bi-directional trust) and then Tableau can "see" users in multiple domains - which is probably what you want.
Become a Viz Whiz on the Forums!
Support the Community and master Tableau.
Retrieving data ...