The way Philips Hue is setup, we can only tell the hub to activate a scene. The scene itself is configured through the official Philips Hue app. They recently made a change to how this works and I believe that you can only apply your scene to all the lights in a "room" in the new version.

Also note that there was a bug in the current version of the iOS app that might make scenes not work for your setup. There is an updated version on the way to the App Store that fixes this bug, so it should be live in a few days.

Sorry for the inconvenience!