...
Please note that if you contact our support about an error, it is unlikely that we will be able to help, as the error messages come directly from Amazon and are usually caused by incorrect configuration of the credentials. We recommend that you contact Amazon first, as they have more insight into the logs and can tell you why you are seeing the error message. If you do not get any error message from the WHMCS gateway log Gateway Log and from the browser console, please get in touch with our support team.