Can’t Redeem gift card

Greetings aziz1400,

Thanks for visiting the Apple Support Communities! I understand you're unable to redeem a gift card as expected, as an alert appears stating the iTunes Store is unable to process gift cards at the time.

I suggest viewing the System Status page to determine if there is any scheduled maintenance or outages affecting the iTunes Store: Apple - Support - System Status

If the issue persists, I suggest contacting Apple Support, as outlined in the "Get help from Apple Support" section of the following article: If you can't redeem your App Store & iTunes Gift Card, Apple Music Gift Card, or content code - Apple Support

Cheers.