We have fixed IFTTT "change color" and "change color temperature" issue, it's big bug. Thanks! Please have a try!
"Set scene" needs to read the scene bundle you created, if you haven't saved any scene bundle yet, please goto settings, scene bundle and create one. This feature is targeted for multiple devices, you can adjust any number of your devices to a wanted state and then save, then we will create a scene and saved to cloud.