I have a very simple map service that I want to use in a web appbuilder app. The service is published on a server with ArcGIS for Server. The URL for the REST Endpoint is: Test/PFRA2Fluvial (MapServer)
When I add this serice to a new webmap and then enable the popups on the layer within the service, then I can't get the popup to display.... comes back with 'no information available'.
Running out of ideas as to how to fix this.