Same issue here. Though I managed to buy one gift card, I was trying to buy a second right after the first and it has continuously failed. I have tried different browsers, different credit cards. Same error each time.
Hey @r_c_l, and welcome to the community.
Hope you're doing great!
Can you send me a screenshot of the error message being shown? Also, have you tried using a different payment method?
Let me know how that goes :)