ArcGIS Portal 10.5.1 Multipoint does not display as a Heat Map

[StevenWeaver1]

I'm using ArcGIS Portal 10.5.1, when I create a map service from a multipoint feature class, I can create a feature layer and select the Heat Map option.  However, it never appears in the web map.  No error appears, it just does not display anything.  If I use a regular 'point' feature class, the heat map works as designed.  Is a multipoint feature class not acceptable?  

[MegHoole]

We seem to share your experience in ArcGIS Online 

[EricPeña]

Same issue here.  I have a very large point layer that must be multi-point.  Heat mapping on this multipoint works in ArcGIS Pro but not in AGOL or Portal.  Did you ever find a workaround?

[Dvirus]

Same issue in  ArcGIS Portal 10.8.1 😞