There is an order hall in BFA, but instead of being a class order hall, it is an order hall for everyone. This order hall is actually a ship. Both Alliance and Horde have a ship located in the harbor of Zuldazar in Zandalar (Horde) and harbor of Boralus in Kul Tiras (Alliance).
Horde Order Hall
Alliance Order Hall
To unlock upgrading your order hall with traits, you must complete a certain part of the big War campaign (check my full guide covering entire war campaign here).
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