If you're playing Harry Potter: Magic Awakened and there is currently no game audio, this is typically due to having "Silent Mode" turned on with your iPhone. You can toggle this off to have game audio by flipping the Ring/Silent switch on the side of your iPhone. Using headphones will also bypass this setting if you wish to keep your device silent.
Learn more about this function from Apple Support here: https://support.apple.com/HT208353
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