Maybe there is no authorization to turn on the microphone. You can choose microphone authorization in the APP, which can solve the problem of not hearing sound. It is also possible that the silent mode is turned on during use, and it can be turned off.

The solution is as follows:

1. is not authorized to be opened.

You can download a small home APP and select microphone authorization in the settings to solve the problem of no sound.

2. Silent mode is turned on.

Download a small home APP and choose to turn off the mute mode in the settings, which successfully solved this problem.