I have the same issue. I have tried to hire through credit card (VISA) and Paypal, but nothing works.
I hope you can help s.t. I can hire someone for my project.
Please go to your account settings and chose top tab on left, ''My Info''. Kindly, try adding address details and phone number in order to fix this error.
If the issue persists after this please let us know and our team will assist you further.
I HAVE SAME ISSUE BUT JUST FOR VISA DEBIT CARD.
WHY DO I SEE IT SAY You don't have a valid billing method on file with Upwork. Please correct this before making an offer.
IT IS CORRECT I HAVE USED IT BEFORE