If you have a Pinfinity Pin that is supposed to play music or sound effects, make sure your volume is turned up on your mobile device and silent mode is deactivated. Pins that play sound effects generally require you to tap the image on your screen to play the sound effect, rather than it playing automatically on a loop (because that could get annoying for users!).
If you continue to run into issues, feel free to submit a help center ticket and our support team will be happy to assist you!