When you tap the YouTube Music tile, does it start to play the music automatically?
You can use the community developed Fully Kiosk Browser device handler, and use Rule Engine to control your Fully Kiosk browser to load a URL, so I am not sure what URL are you using in the tile, but you may want to give it a try.
See below for the links to the device handlers, and how to use the loadURL command in Rule Engine.
