private string _CreateUser(string name, string fullName, string siteRole, string authSetting)
{
//ref: https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api_ref_usersgroups.htm#add_user_to_site
var sb = new StringBuilder();
var xmlSettings = new XmlWriterSettings();
xmlSettings.OmitXmlDeclaration = true;
var xmlWriter = XmlWriter.Create(sb, xmlSettings);
xmlWriter.WriteStartElement("tsRequest");
xmlWriter.WriteStartElement("user");
xmlWriter.WriteAttributeString("name", name);
xmlWriter.WriteAttributeString("fullName", fullName);
xmlWriter.WriteAttributeString("siteRole", siteRole);
xmlWriter.WriteAttributeString("authSetting", authSetting);
xmlWriter.WriteEndElement(); //</user>
xmlWriter.WriteEndElement(); //</tsRequest>
xmlWriter.Close();
var xmlText = sb.ToString(); //Get the XML text out
//Create a web request
var urlCreateUser = _onlineUrls.Url_CreateUser(OnlineSession);
//var urlCreateUser = "******";
var webRequest = CreateLoggedInWebRequest(urlCreateUser, "POST");
SendRequestContents(webRequest, xmlText);
//Get the response
var response = GetWebResponseLogErrors(webRequest, "create user");
var location = response.Headers.Get("Location");
string split = "users/";
string tableauUserId = location.Substring(location.IndexOf(split) + split.Length);
return(tableauUserId);
}