Email address

I want to buy something from the gajin market, but you need to enable two step authentication and in order to do that it requires I bind a n email, but it wont let me use the email i used to create my steam account. How would I go about rectifying this?

It show any error notification? Possibly is better get in contact with the support at https://support.gaijin.net because I belive that you can associate your Steam account E-mail in a Gaijin.net account.

But I think I may be able to help you but before anything ask support first to confirm these actions:

Now again, confirm with the support team if this is the right answer, if not, follow their steps because only they can give you the right answer about this issue.