I'm setting up Amazon Pay & Login with Amazon for a client. I had previously setup the account without an issue. I recently had to perform a fresh install of WordPress and all plugins, so Amazon Pay was disconnected. Upon reconfiguration, I'm receiving the error code: InvalidButtonAccessRequest when attempting to place a live order on the site. However, I have no issue placing a test order in sandbox mode. I have looked extensively online for an answer and came up with nothing. Both the site and Amazon Pay are in production mode when attempting to place a live order. I have deactivated plugins to troubleshoot with no avail. What could be the issue?