Au Ra and purchasing expansion on 2 systems

[Mission]

You PAID the money to access the expansion and it's content on a singular platform. There is no "double buy expansion pay wall" unless you foolishly choose to play the game on multiple platforms, that is not the intended way to play and it's not Square's fault for not catering to people who make that choice.

They wouldn't allow cross play with the same character if it wasn't one of the intended ways to play....