Hello,
Have you by chance tried reloading the web browser (Login page) and FH? Sometime's that help's when i am having troubles.
Has it allowed you on the account before? After the User reset. I would also make sure that the login browser isn't reloading when you go to game, make sure the browser is open (Not minimized), that has been an issue for many.
If i remember right it is Case sensitive so be sure that user/pass match up on both game and the login screen. Otherwise i'm not sure i can be of much more help.. Definitely curious if its something other so i can know for future reference when trying to be of assistance.