Okay … so to everyone who is having this problem, it turns out that sometimes the default packages don’t get created and you need to get Steam to add them. There is a quick way to check and I have added some screenshots to show you what you should be looking for.
Log on to your Steam Partner page and go to the main page of your game.
Check if you have something similar to the below image listed at the top of the page:
If you don’t then you need to contact Steam Partner Support to get it added. You can confirm it is added by clicking on the link below, on the same page:
And then looking for these entries near the bottom of the resulting page:
If all that is there then your default packages are correct and it should all work. If none of those entries are there, contact Steam Partner Support and they will quickly add it for you. I got mine added by joining the Steamworks Development Group (http://steamcommunity.com/groups/steamworks) and asking for help there: http://steamcommunity.com/groups/steamworks/discussions/0/144513248270856551/
Steamworks Partner Support saw my post, checked my app and added the packages for me … and so now when I am testing my game with Steam logged in and the Steam subsystem configured, I finally have this:
@bigpapaleo @franktech @xiaoshumiao @Tesla So for those of you struggling with this, it was a Steam problem and not an Unreal Engine problem and the only way to get it resolved is to get in touch with Steam Partner Support. I must also reiterate that this doesn’t always happen.