A Promotion codes cannot be used with ibisAccount that are linked to external accounts (X, Facebook, or Apple). Please try logging in again with an ibisAccount that is not linked.

If you do not have an unlinked ibisAccount, please create one here:
https://account.ibis.ne.jp/createAccount

If you are unsure whether your account is linked, please log in on this page:
https://ibispaint.com/linkAccount.jsp
If the screen displays "Your account is already linked to an ibisAccount.", then your account is linked.