NDSP Billing issue

Hey all, having an issue during checkout on the Neural website. I’m trying to use a card that’s billed in another country but accepts international transactions, but I’m based in the US. However, I keep getting an error message saying *this card could not be added* after clicking pay now.

Just wondering if anyone else faced the same issue and any fixes?

I have made sure to enable international online transactions on the banking app, as well as trying both card based billing address and US address.