I didn't get this after getting lv.75 in a class(I actually have 4 at lv75).
Converse with fellow players
this is a confirmed issue and there is a theory that this mission is actually linked to advanced classes not in the game yet. phantom/etoile etc...if this is correct the mission should not have been included in the current content.
@radiofr33 Rip. I'm actually waiting on a Scion myself, which if we have all of the balances, I don't get why they wouldn't include them(Considering Summoner was pulled from EP...4? 5? I forget). I guess they don't want to confuse us with the fact they can't have subclasses.