Why can't I use my Vanilla Visa Gift Card on eBay?

It's activated. I already registered it. It's the $25 one. I got this message when I tried to buy something off eBay: "Your credit or debit card has been declined for this transaction; PayPal could not validate the card. Please verify that the information you entered is correct, or try a different... show more It's activated. I already registered it. It's the $25 one.
I got this message when I tried to buy something off eBay:
"Your credit or debit card has been declined for this transaction; PayPal could not validate the card. Please verify that the information you entered is correct, or try a different credit or debit card."
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