Can't Create folders with Box API

I'm using the Box APIs to perform some operations from a browser. I can upload, replace, list, download and delete files just fine. I'm running into problems with creating folders.

Before creating a folder I do query to see if it already exists. Once I see it doesn't I issue a request to create the folder and I Get back the following.

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://' is therefore not allowed access. The response had HTTP status code 400.

Looking in the settings for the application I see that I've got my domain already listed in the CORS settings (if it were not I imagine the other file operations would have failed). Why am I getting this response and how do I resolve the problem behind it?

var createUrl = "https://api.box.com/2.0/folders?fields=name,id";
$.ajax(
    {
        "method":"POST",
        "url": createUrl,
        "data": { "name": name, "parent": { "id": parentFolderID } },
        "headers": {
            "Access-Control-Allow-Origin": origin
            , "Access-Control-Allow-Credentials": true
        },
        "beforeSend": function (xhr) {
            xhr.setRequestHeader('Authorization', 'Bearer ' + token.AccessKey);
            xhr.setRequestHeader("Access-Control-Allow-Origin", origin)
        },
        "success": function (e) {
        },
        "error": function (e) {          
        }
    });

Response Headers

POST /2.0/folders?fields=name%2cid HTTP/1.1
Host: api.box.com
Connection: keep-alive
Content-Length: 52
Origin: https://localhost:44390
Authorization: Bearer xxxxxx
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Access-Control-Allow-Origin: https://
Accept: */*
Access-Control-Allow-Credentials: true
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36
Referer: https://localhost:44390/Playlist/Edit/d4b6664edc
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8

Request Headers

Accept:*/*
Accept-Encoding:gzip, deflate, br
Accept-Language:en-US,en;q=0.8,ja;q=0.6
Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:https://
Authorization:Bearer xxxxxxxxxx
Connection:keep-alive
Content-Length:52
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Host:api.box.com
Origin:https://
Referer:https:///Items/Edit/d4b6664edc
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

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