Cannot unlock any non basic jobs.

[Niwashi]

Support class quests do not matter.

Yes you do have to do complete the support class quests.

I wonder if they've made a stealth change to that. Originally, you only needed the main class's class quests done. Then they added the Slyph Management requirement. I hadn't heard of them adding a requirement for the sub-class's level 15 quest. If it's needed now, it must be a more recent change, because I know you didn't used to need it.

Well, at any rate, glad you got it sorted out, Carvo. Have fun with your new jobs.