I can’t remember exactly how I fixed it, but I will suggest 2 things.
- Download the “Advanced Sessions” plugin. This will make your life 1000x easier when working with steam. It exposes a bunch of new blueprint nodes to use with Steam.
- Check to make sure that in your “Steamapps/common/GAMENAMEHERE/” folder, you have a file called “steam_appid.txt” (I didn’t see that mentioned here)