PayPal : Invalid Configuration This transaction cannot be processed due to an invalid merchant configuration.

I have read multiple threads on this forum with this error message.

Some of my clients are getting this, but not all of them. 

I have called PayPal and gone over the account, making sure the account was verified, and that the business agreement was active/agreed to. They insist the account is fine. 

I have imbedded the form using the iframe imbed.

I am not really sure what to do next, please advise.

I took a look at the page above and I see that the form https://secure.jotformpro.com/form/52224217388960 is indeed embedded using iframe embed method.

Now looking at the form itself I can not see anything off with it neither.

Can you please tell us if there is anything same about those that are getting these errors? - What I mean by that is if there is a pattern - for example, IE users, or mobile phone users, etc.

That would allow us to see what might be happening.

I have also just cleared your forms cache to make sure that it is not the one causing any issues.

If there is anything in common that the users experiencing these issues have, do let us know.