Can't log in into z8games account

2 weeks or so ago I could log into my account without a problem, but now it says ID format is invalid. I tried retyping, everything, I still can log into CF and play, but I can't go to my account on z8games. Which is not a big problem but I do want to buy ZP. I can't submit a ticked because I can't provide payment information. I haven't played for a year and of course having an account for 6 years it's inevitable that I forget my email and security question. So, can someone explain to me what is "ID format is invalid"?

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