ArcGIS Maps for Power Bi join feature not working

Adding this for anyone who stumbles here in future.  I've been looking for an answer to this problem for days, and finally figured out that, firstly the visual element's interface appears to have been updated so some of the suggestions made prior to now don't seem to be relevant any more.  Nobody suggested this anywhere, but I had to turn the 'analysis' option on for the join settings window to show up.  Yes, finding an area out of several and joining to it is analysis it seems.  The Arcgis pros in my org didn't think it was, but of course every time you link to one I guess its going to cost you a credit it seems.