[SOLVED] Lync UCWA - Create application gives a HTTP 409: Conflict error

I have been trying for the past couple of days to develop an application for our Lync service at work using the UCWA API from Microsoft (a REST API). To get an application working: I first have to submit it to the API using a POST request to a certain URL. First, I have to authenticate with the server, and I do that by posting a username and a password credential to the API. I then get an access token back which I can use to make further requests to the API by posting the token inside the header of each request. I have been able to get an access token working, but when I try to register the application by posting a HTTP request to https://lyncextws.company.com/ucwa/oauth/v1/applications: Things will start to go wrong.

All this is done through one JavaScript file working with iframes to bypass the Same-origin policy.

This is what my code currently looks like:

<!DOCTYPE html>
<html lang="no">
    <head>
        <meta charset="UTF-8" />
        <title>PresInfoDisp</title>
    </head>
    <body>
        <iframe src="https://lyncextws.company.com/Autodiscover/XFrame/XFrame.html" id="xFrame" style="display: none;"></iframe>
        <script type="text/javascript" src="jquery.js"></script>
        <script type="text/javascript">

        var access_token;

        var stage = 0;

        // CONNECT AND AUTHENTICATE WITH LYNC UCWA SERVICE
        function connectAndAuthenticate() {

            stage = 1;

            var request = { 
              accepts: 'application/json', 
              type: 'POST', 
              url: 'https://lyncextws.company.com/WebTicket/oauthtoken',
              data: 'grant_type=password&username=alexander@domain.company.com&password=somePassword'
            }; 
            document.getElementById('xFrame').contentWindow.postMessage(JSON.stringify(request), 'https://lyncextws.company.com/WebTicket/oauthtoken');
        }

        // REQUEST A USER RESOURCE
        function getUserResourceAuthRequest() {

            stage = 0;

            var request = { 
              accepts: 'application/json', 
              type: 'GET', 
              url: 'https://lyncextws.company.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=company.com'
            }; 
            document.getElementById('xFrame').contentWindow.postMessage(JSON.stringify(request), 'https://lyncextws.company.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=company.com');

        }

        function getUserResource() {

            stage = 2;

            var request = { 
              accepts: 'application/json', 
              type: 'GET', 
              url: 'https://lyncextws.company.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=company.com',
              headers: {Authorization: "Bearer "+access_token}
            }; 
            document.getElementById('xFrame').contentWindow.postMessage(JSON.stringify(request), 'https://lyncextws.company.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=company.com');

        }

        // REGISTER APPLICATION RESOURCE
        function registerApplication() {

            stage = 3;

            var request = { 
              accepts: 'application/json', 
              type: 'POST', 
              url: 'https://lyncextws.company.com/ucwa/oauth/v1/applications',
              headers: {Authorization: "Bearer "+access_token},
              data: {'userAgent': 'InfoDisp1',  'endpointId' : '2d9dc28d-4673-4035-825c-feb64be28e4e', 'culture': 'en-US'}
            }; 
            document.getElementById('xFrame').contentWindow.postMessage(JSON.stringify(request), 'https://lyncextws.company.com/ucwa/oauth/v1/applications');

        }

        // GRAB A LIST OF CONTACTS
        function listContacts() {

            stage = 4;

            var request = { 
              accepts: 'application/json', 
              type: 'GET', 
              url: 'https://lyncextws.company.com/ucwa/oauth/v1/applications',
              headers: {Authorization: "Bearer "+access_token}
            }; 
            document.getElementById('xFrame').contentWindow.postMessage(JSON.stringify(request), 'https://lyncextws.company.com/ucwa/v1/applications');

        }

        this.receiveMessage = function(message) { 

            switch(stage) {
                case 1:

                    var beforeReplace = message.data.replace("/\\/g", "");
                    var json = jQuery.parseJSON(beforeReplace);
                    var json2 = jQuery.parseJSON(json.responseText);
                    access_token = json2.access_token;
                    console.log(json2.access_token);
                    console.log(message);

                    getUserResource();

                    break;
                case 0:
                    console.log(message);

                    connectAndAuthenticate();

                    break;

                case 2:

                    var beforeReplace = message.data.replace("/\\/g", "");
                    var json = jQuery.parseJSON(beforeReplace);
                    var json2 = jQuery.parseJSON(json.responseText);
                    console.log(json2._links.applications.href);

                    window.setTimeout(function(){registerApplication()}, 5000);

                    break;
                case 3:

                    console.log(message);

                    break;
                case 4:



                break;
            }


        }; 
        window.addEventListener('message', this.receiveMessage, false);


        $(window).load(function() {
            getUserResourceAuthRequest();
            //console.log(access_token);
        });

        </script>
    </body>
</html>

When I run this code: The last ajax query returns the error 409: Conflict, when it should be returning 201: Created

This is what my browser (Google Chrome) outputs: What my browser outputs in the developer console in Google Chrome

The 401: Unauthorized error is supposed to happen, but the 409 Conflict, should not happen. So here is my question: Can anyone spot why I get this 409 error instead of the 201 I should be getting?

The example code from Microsoft seems to work fine, but I want to avoid using that as it will take me a very long time to familiarize myself with it.

If there is missing data you need to spot the issue: Let me know in the comments, and i'll provide it!