Unity 2018.3.3 Packing ios no music and sound effects

1:The other platforms are working fine.
2:I tested the code. Muisc.Play() did execute, but no sound.
3:I tried a different ios device and ios version. Can’t work。

Unity version 2018.3.3
macOs version 10.13.6
Xcode version 10.1

I turned off the phone’s sound switch. I am a fool.