We are using WebApp Builder Developer Edition 2.2 and hosting it in our own environment.
I have published a feature service containing a feature class and a table with which a relationship class exists. When I access this feature service in the Developer Edition and click on one of the features to get a pop up, I do not see the related table.
When I create the app in the AGOL WebApp Builder though, and add the data, clicking on a feature to get the pop up reveals the related table.
It is absolutely necessary that users have access to the related table when clicking on a feature, but I would prefer to use the Developer Edition. Any thoughts on why functionality differs between the two as it pertains to a feature service containing a feature class and table with a relationship class?