If sound isn’t playing through your app when you're reading an Immersive Story, make sure your volume is turned up and the sound icon is unmuted. If you still don’t hear anything, force close your app and re-open!
You can learn more about muting and unmuting here: Muting
Please note that certain stories may be the author's original version and may not have sound. This information can be found on the initial summary page under "Notes".