Hi there. Head over to this article and read through the troubleshooting steps there. If these solutions don't resolve your issue, you can contact Bungie via the form at the bottom and they can look further into it. https://www.bungie.net/en/Help/Troubleshoot?oid=13681
Go to consumables and under where your engrams are supposed to be there will be another box containing your ornaments. Open that and they will appear in your inventory.