@Tesla and @xiaoshumiao and @bigpapaleo … do you think this is a Steam problem or an Unreal Engine problem. I have tried a few other things and yet I am still not able to test it. My next step is to try the Steam Setup Utility, but at the moment I am not too optimistic.
I would like to hear from other developers who have released a Steam game using Unreal Engine.
EDIT: I posted a question on the Steamworks Development group … will see what responses I get there.