You lost your emblem because instead of linking your Steam account to your existing bungie.net profile under your PSN ID, you created a new profile with your Steam account and moved your PSN account over to it. You can tell it is a new profile because it shows as being created today. Emblems you got via code redemption are tied to the bungie.net profile not the actual platform account. Unfortunately, there is nothing that can currently be done. Due to back-end issues with the profile recovery process, it has been indefinitely disabled.