So despite me being able to log in now as I mentioned; I've been keeping my tabs on this thread to see if I can help everyone else solve theirs.

As expected; they believe the maintenance fixed the issue BUT I do see they have OCE maintenance coming up very soon so perhaps they're doing another run of it to fix more instances of it (Or it's just server stability fixes)

With that said, I did get this reply from one of my many tickets I had submitted on one of my JP alts; meaning they did see it as a major issue and escalated it. However clearly it was not fixed for everyone.

I'll send a reply to this letting them know that others are still having the issue.