If your gift card is often a "valid only in the United States" one it will not be authorized at locations outside united states.
I just earned 45 bucks in five weeks of casual use and turned that suitable into a $5 Amazon gift card. My daughter absolutely loves gift cards because she wants to shop. https://Groups.Google.com/g/giftcard-mall-my-gift-info/c/lJb4jNQqwjY