Access Token Response Blank

I have been working on automating our user management for Creative Cloud. I am able to get the JWT to send https://ims-na1.adobelogin.com/ims/exchange/jwt  and receive a 200 response but I do not have the access token in the body of the response.

Is there something else I am missing?

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

KeySpec ks = new PKCS8EncodedKeySpec(privateKeyFileContent);

RSAPrivateKey privateKey = (RSAPrivateKey) keyFactory.generatePrivate(ks);

String imsHost = LocalProperties.getInstance().getProperty("imsHostBase");

String orgId = LocalProperties.getInstance().getProperty("orgId");

String technicalAccountId = LocalProperties.getInstance().getProperty("technicalAccountId");

String apiKey = LocalProperties.getInstance().getProperty("apiKey");

String metascopes = new String (LocalProperties.getInstance().getProperty("metascopes"));

String aud = "https://" + imsHost + "/c/" + apiKey;

String meta = "https://" + imsHost + "/s/" + metascopes;

jwtToken = Jwts.builder()

.setHeaderParam("Content-Type","application/x-www-form-urlencoded")

.setHeaderParam("Cache-Control","no-cache")

.setExpiration(expirationTime)

.setSubject(technicalAccountId)

.setAudience(aud)

.setIssuer(orgId)

.claim(meta, TRUE)

.signWith(RS256, privateKey).compact();

HttpsURLConnection connection;

connection = (HttpsURLConnection) new URL(imsHost).openConnection();

connection.setRequestMethod("POST"); // PUT is another valid option

connection.setRequestProperty("Cache-Control", "no-cache");

connection.setRequestProperty("Content-Type","multipart/form-data");

connection.setDoOutput(true);

connection.setDoInput(true);

connection.connect();

DataOutputStream os = new DataOutputStream(connection.getOutputStream());

os.writeBytes(urlParameters);

os.flush();

os.close();

//getResponse from POST

int responseCode = connection.getResponseCode();

System.out.println("Res msg " + connection.getResponseMessage());

System.out.println("\nSending 'POST' request to URL : " + imsHost);

System.out.println("Post parameters : " + urlParameters);

System.out.println("Response Code : " + responseCode);

if (responseCode == HttpURLConnection.HTTP_OK) {

     Map<String, List<String>> mapResponse = connection.getHeaderFields();

     for (Map.Entry<String,List<String>> entry : mapResponse.entrySet()) {

          System.out.println("Key: " + entry.getKey() + " Value: " + entry.getValue());

     }

     InputStreamReader inputStream = new InputStreamReader(connection.getInputStream());

     BufferedReader in = new BufferedReader(inputStream);

     String inputLine;

     String sbResponse = new String();

     while ((inputLine = in.readLine()) != null) {

          sbResponse.concat(inputLine);

     }

     in.close();

     // print result

     System.out.println(sbResponse.toString());

}

else {

     BufferedReader err = new BufferedReader(new InputStreamReader(connection.getErrorStream()));

     String errorLine;

     StringBuffer sbResponseError = new StringBuffer();

     while ((errorLine = err.readLine()) != null) {

          sbResponseError.append(errorLine);

     }

     err.close();

     // print result

     System.out.println(sbResponseError.toString());

}