I had an experience with a solution that I was applying to ArcGIS Enterprise 10.9.1. Solution is Lead Service Line Inventory (only version 1.0 is available for 10.9.1). During the installation of the solution, it asks for a Coordinate System and I gave it ours (wkid 2881...State Plane HARN Florida East US Feet). It ignored that coordinate system and left it in Illinois State Plane (Naperville). In this case, the services are empty, so no need for projection, but I need the 3 feature services changed from Naperville to the same projection as the rest of our Water Network.
