I think Server is quite relevant for my question.
As my first post stated, I have reset my password. I'm sure the password is (or has been) correct, since it's still working fine for this forum, marketplace, my account site, you name it, just not for logging into the game. I could mistype it one or two times, okay, but not twenty+ times.
I tried all day now, successfully logging into the game about two hours ago. When I logged out and tried to get in again to check if everything's fine now, it all started over again.
My credentials working fine on everything else but the actual game and that one succesfull login in between leads me to believe, that this IS indeed a server-side issue. Twink accounts still working fine ingame, so it doesn't seem to be a client-side problem.
Edit: It really seem sto be a problem with the login server. Every20-30 tries I get one successful login and everything works fine. I changed region, just in case, logged back out. Tried to get back in, BOOM, same problem.