Hi! I got the same error message when I tried to add a new card I just got today, so I called the bank and they told me I couldn't add it because it didn't have any money on it yet and PayPal needed $1 to verify it was a real account. You probably worked it out in the meantime, but I'm replying just in case anyone else is hitting this wall. PayPal could offer an explanation for that error to notify you to put $1 in your account so you wouldn't have to call the bank...
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