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I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
I would like to inform you that you can only play a sound when your iPhone has an active internet connection. This allows Find my iPhone to establish a connection with the iPhone.
Find my iPhone will not be useful if your phone doesn't have cellular data turned on of if it's not connected to WiFi.
I hope this information helps.