Hi, I can't find solution now, but I think, that it was one, so somebody can send me link or something.
I have: Error logging in to Gameforge Client account (mail, login), please check if the login data is correct.

Logging in too many accounts with the same IP can also cause this error to happen, in that case wait a few hours.

It was first account in this day, and second yesterday, I wait, but it didn't solve this problem. I used account creator, to make this accounts.
Screen in attachments.

Still have this same problem using steam account.
Proxifier is free only for one month, so it can be just a short solution.