Troubles linking account

[Uzi556677]

Hey everyone just a quick problem: I'm trying to link my account to https://dawnofwar.info/esl/register and whenever I put in my 64-bit steam ID I get an error saying that its an unknown ID. I've tried putting the numbers in one by one and copy pasting, any help would be appreciated!

[Dark Riku]

Just follow the steps again (read properly) or show us exactly what you are doing.