Use Deluge to assign a task by id in Desk, using create or update

Has anyone successfully used Deluge to assign a task by user id in Desk, using create or update?

Looking at this, https://www.zoho.com/deluge/help/desk/create-record.html, it seems like I --might-- be able to map assigneeId. But, I get this error: {"errorCode":"UNPROCESSABLE_ENTITY","message":"An extra parameter 'assigneeId' is found"}

param.put("assigneeId","513xxxxxxxxxxxxxxxxxx");

Or, is there another way?

param = Map();

param.put("ticketId",ticket_id);

param.put("subject","subject here");

param.put("departmentId","513xxxxxx");

param.put("description","description here");

param.put("dueDate",due_date);

param.put("status","Not Started");

param.put("assigneeId","513xxxxxxxxxxxxxxxxxx");

orgId = "718xxxxx";

response = zoho.desk.create(orgId, "tasks", param, "zoho_desk");

info response;