I have built an app using Web App Builder. It has a Map which has a map layer that is served by a map service by ArcGIS Server. All these components are local on my computer including the Portal and ArcGIS Server. Everything works well on my computer. However others are only able to see the basemap when they connect to my app but not the layer data itself. All the resources including the Map, App etc. are shared with everyone. What is going wrong here - seems I am obviously missing something? Can someone please help me - this is really frustrating. Thank you!