I am unable to assign anyone to a faction. Is there a prereq?
In my current game I am unable to assign a leader to the Endless Emporium. Hovering over the header of that column shows a tooltip that says that a Minister of Finance is required. There may be similar requirements for the other 3, but since I'm already able to place leaders there the tooltip isn't showing me requirements anymore.
Edit: I just started a new game as the Yor, and while the Endless Emporium is locked at the start of the game, the other 3 are available to me right from turn 1.
What race are you playing?