ID or password is incorrect.

I was on one of my accounts earlier and stayed logged in for about 5 hours. After logging out to get on my other account, I was met with the prompt, "ID or password is incorrect" when I can log into Lodestone and Mog Station fine. Changing password also wasn't an issue but the authentication server in the Loader client won't let me through. Now when I try the account I was on which I logged off from not too long ago won't go through neither.

Log in server issue... please assist.

Just got hit with the same issue myself, can log into Square Enix account and Mog Station just fine, but the launcher refuse to let me in.

Bump, just waited 6 hours with any reply from SE...This better not stop me from being able to play the rest of the weekend...

Seems to be working fine now.

Still getting the same problem, this is starting to get ridiculous.