Please set your Steam profile to public for a successful connection.
1. Sign in to store.steampowered.com and go to your Profile
2. Tab Edit Profile
3. Go to Privacy Settings and set your profile to public.
· My profile: Public
· Game details: Public
· Always keep my total playtime private even if users can see my game details: Uncheck
· Game details: Public
· Always keep my total playtime private even if users can see my game details: Uncheck