Hey guys, I've had the same issue, and after fooling around with a few pseudos/password combinations, I realised the key mapping might be different in game as it is on the website.
Just try to type your password on the Pseudo field (first one), to see what it actually writes ! I had numbers in my password, and I used the keypad, but instead of "1", pressing the "1" key on the keypad displayed "&", so my password was wrong, simple as that !
So if you have numbers in your password, and you are using the keypad to type them in, try using your regular number keys instead, or try changing your password so that you don't have this problem anymore !
Hope this helps
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