I have redeme my card but could not use it?

Please review this support article. The article has solutions for common issues they encounter with gift cards. There is a link at the end of the article for additional assistance if needed.

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

To : lilly-8 Gift Card Redemption

Hi lilly-8 ,

Do you have a balance on your account where you redeemed the card ?

Tip > the credit must be spent in the country where it was purchased ( don't know if that applies to you) .

Try the iPhone iOS 16 User Guide .