Assigned To column is not retrieved in OData connection

[Steve Ozmer]

I'm using Spotfire's (build version 7.11.1.0.25) OData Connector to access a Sharepoint 2016 Task List. The frustration is that the column "Assigned To" is not retrieved in the data connection. I also do not see a cloumn named "AssignedToID" which I could use to add a relation. What's missing here