Why can't customers checkout with gift cards in their cart?

hello! I already make new gift card as a product for my customer. but suddenly, after they add gift card product in their cart, they cannot checkout the gift card product. which means they cannot go through to payment page. how can i fix this?

Are you able to give some more context on the issue? For example:

  • what error was seen?
  • What are the replication steps (with example links to the product).

The more info you can give will reduce the amount of guesswork on this side.

this is the example when i try to buy the gift card.

link gift card : https://shop.amniaga.com/search?type=product&q=gift+card