Have you entered the redemption code?
Paying with an eBay gift card
You'll need to use your redemption code to pay for an item with your gift card. Here's where you'll find your gift card redemption code:
Physical cards – Scratch off the security coating on the back of the card to reveal the code
Digital cards – The code is in the email you received
When you're ready to make a purchase, here's how to pay with your eBay gift card at checkout:
Enter your postage and payment details.
Scroll to the bottom of the checkout page and enter the gift card redemption code in the Gift cards, vouchers, coupons field.
Select Apply to see your new total.
Check your details again and select Confirm and pay.
But ebay could be having technical issue - there is a note on the help pages that digital cards are currently unavailable. Not sure if that is just to buy or includes to use.
