One time audio on collision

i want to have some pick up items in my game play a sound to show you picked them up but the audio wont play, i have tried many different scripts from the forums but none of them seem to work, can anyone help me? The audio only plays when I start the game

Script i am using
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Avoid using Find. Instead, use GetComponent() again.

You are likely finding the wrong item, and playing it too far from the AudioListener to hear.