This gift code only works on Amazon.es in Spain. You need to have a second payment method added (Credit cards/Bank accounts) and a verified address to redeem it on Amazon.es account. Amazon's anti-fraud process locks cards and accounts if they suspect their terms are broken, the most common reason is being outside of your country and/or using a VPN, but there are others like: reselling/dropshipping, adding a gift card on a brand new account with no other payment methods added, adding excessive amount of high denomination gift cards in a short time period, and others.