The reasons may be as follows:

1. The Douyin APP did not obtain the microphone permission. During the live broadcast, you need to turn on the microphone permission to input and output sounds. You can check whether Douyin APP has microphone permission in the phone settings, or confirm whether Douyin APP has microphone permission turned on before starting the live broadcast.

2. The network condition is not good. Douyin live broadcast requires a good network environment to play the sound smoothly. If the network connection is unstable or the network bandwidth is low, the song will have no sound or be interrupted. You can try switching to another network or increasing the network speed for a better network environment.