Thanks for using the Apple Support Communities. I understand that you are looking to redeem an iTunes Store Gift Card that was purchased in a different country. For more information on that situation, you may find this article helpful:
Card or code is from a different country
iTunes and Apple Music Gift Cards are country-specific. If you're trying to redeem an iTunes or Apple Music Gift Card that was purchased in a different country, make sure that you're redeeming it in the same country's iTunes Store. You can't redeem cards outside of the country of purchase. For example, an iTunes Gift Card purchased in France can't be redeemed in an iTunes Store in the U.S.
When redeeming Apple Music Gift Cards, make sure to redeem the cards in the same country’s iTunes Store. You can’t change countries while you have an active membership.
If you need more help, contact us.
If you can't redeem your iTunes or Apple Music Gift Card or content code - Apple Support
Regards.