@ismcagdas Thank you for your response.
Is there something beyond adding the CORS information to the customHeaders section of the web.config that needs to be done in order to enable CORS for the Web API? There doesn't appear to be any specific documentation for this on the .NetZero website. It is mentioned for the projects that use .Net Core, however we are using the MVC5 with JQuery version and there doesn't appear to be anything (that I can find) to specify any specific configuration requirements.
Many thanks, Kenny