Staff here. Your site account is fine and not blocked, so nothing is wrong on that side. Two questions so we can pin it down: are you trying to log in on the website itself, or inside the GUU tool? And what exactly happens, an error message or just a bounce back to the login form? If the website works but GUU does not, the tool may need an update since logins got stricter recently, and that would be good for vancer to know. If the website itself rejects you, do the forgot-password reset MrMazda suggested and check that you log in with your username, not your email.