New seller issues

Hello everyone, I recently decided to sell on amazon (or at least try to lol) and the signup process and everything went flawlessly. But now, after all of that it says my charge method is invalid. It is a legit CC from a legit bank, and I’ve double checked the info 30+ times. And it’s all 100% correct and I have no idea what to do because amazon support is being “so helpful” as always. Anyone else have this issue? Any and all help would be appreciated. Thank you so much!