In the 8.3.1 Tableau update the built-in geocoding role for Australian LGAs (they are hidden away under the role title “County”) have been updated to the 2014 specification defined here. Previously they were using an earlier release and we didn’t recognise the “unincorporated” regions. Now we do. So, yay!
Also remember that if you have custom geocoding roles loaded you need to remove them to get the new built-in roles to show up. Then you can reload your custom roles and all will be good.