After waiting a few minutes after trying to add it on my desktop web browser (even with the OBJECT Object, error) the scene just showed up. I then tried adding a new one through my iPad and it showed up as well (although it asked me to wait while it added the scene and displayed the “scene added” message). So maybe the first time you create a scene you have to do it through the web interface and not on a iDevice. You might want to check into that.
I now have another problem but will post it on a different topic, to keep them separate.