VR Preview steam won’t work with, and in shipping builds the appid.txt needs to be in the EXE folder, many people place it in the incorrect location.
You could always go to Saved/Logs and post the log as well, but I am assuming that the steam subsystem is actually not loading for you. Do you get the steam overlay active on your project?
I’ll note I did just fix a broken boolean that was preventing the widgets from being released on the hosting menu. It was disconnected during my blueprint overhaul of the template.