I called PayPal and they solved it immediately. It was some security thing and their customer service solved it in 2 min. Had to confirm my identity and received a security code via text to confirm it's me - right after that I was able to add my card. Give them a call - could be the same issue. I've contacted them before and they said it was my bank's fault so it depends who you end up talking to if the problem will be solved or not. Good luck!
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