Java REST Setting the Sender is ignored

I am tryng to change my working code from uploading a single PDF containing a "stage" of forms to upload each form selected from the "stage" as a PDF. Many of the stages select forms which do not contain signatures, so I am not getting any information for the sender and signers until later. I send a REST call to set the package sender and a role for it, but when I download the package it has the account owner as the sender. I am not getting any error or reponse when I PUT the sender. It is just ignoring me. Here is the jsonObject: // change the sender email on the package JsonObject jsonObject = Json.createObjectBuilder() .add("sender", Json.createObjectBuilder() .add("id", sender.getESignID()) .add("email", sender.getEMail())) .build(); Here is the REST I am sending: try { HttpURLConnection connection = (HttpURLConnection) new URL(serviceURL + "/packages/" + packageID).openConnection(); connection.setRequestMethod("PUT"); connection.setDoOutput(true); connection.setRequestProperty("Authorization", "Basic " + apiKey); connection.setRequestProperty("Accept", "application/json"); OutputStream output = connection.getOutputStream(); PrintWriter writer = new PrintWriter( new OutputStreamWriter(output, CHARSET), true); writer.append(CRLF).append(jsonObject.toString()).append(CRLF).flush(); LOGGER.info("E-Sign update package: " + packageID); int responseCode = connection.getResponseCode(); if (responseCode != HttpURLConnection.HTTP_OK) { throwConnectionError("E-Sign error updating package", connection); } } catch (IOException ex) { LOGGER.info(ex.getMessage()); throw new RuntimeException(ex.getMessage()); }