I am trying to automate the creation of server volume reports for various ArcGIS servers in my organization. I have been playing with the Server.ReportManager object in the ArcGIS Py3 libraries, but it seems to require a Federated Portal before it will function. Am I missing something? Do I need to switch over to the ArcPy Py2 libraries or to the REST API in order to query any ArcGIS server, federated or not?