What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I would suggest contacting PayPal support to see what is the exact issue. This I believe that this is an error caused by some settings in your PayPal merchant account.
Also if you can give us a link to your jotform in the meantime we could take a look at it to see if there are any issues with its settings.
Also, if you can direct us step-by-step what you are doing to get the error.