I can not find the answer to why I am getting a 400 error when I try and POST my json. I have manually configured my HTTP request I have added the headers an I know that my json is well configured and I still get this error. Any thoughts?
It's difficult to help much without seeing that POST request. But it might be an HTTP header that is missing or your JSON that does not have the right format.
Have you checked the Load generator logs in case there's anything in there?