Won’t let me purchase sims 4 expansion

[YellowHan]

I have the sims 4, i don’t have the legacy version. whenever i try to buy university on the sale it says that my card info is wrong/ not working, when my card is working on other online and real life stores. i have the normal sims 4 game so i’m not sure why it isn’t letting me purchase. it also won’t even let someone buy it for me as a gift? is this a glitch since i’ve switched computers from an older one to a newer one that plays sims 4? 

[YellowHan]

following up: i’ve tried with different cards and even tried to have a friend buy it as a gift for me.