To resolve this issue, please refer to the following steps:
1. Check if the phone's volume is set too low, which can cause the sound to be inaudible;
2. Ensure that the Mi Home/Xiaomi Home APP has permission to access the phone’s microphone. If not, enable the necessary permissions in the phone's settings;
3. Closing and reopening the APP can resolve temporary glitches that affect sound;
4. Ensure that you are using the latest version of the APP, as updates often include bug fixes and improvements that could enhance audio performance.