With security purposes, we have some limiting rules, regarding the origin of the request to your servers. Please pay attention, when you enter your domain on the tracker initialization step.
Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin. A web application executes a cross-origin HTTP request when it requests a resource that has a different origin (domain, protocol, or port) from its own.