Regions in using map- continent problem

 I wanted to create a Map starting from the region = continent.

A drilldown to Country and finally city is working but the continent does not work. I tried the continent and the place definition as well.  Does somebody have an idea?  The map remains empty at Power Bi desktop ( Sep18).

https://community.powerbi.com/t5/Desktop/Issues-with-Regions-when-using-Maps/m-p/212599#M93895