If you want to hear the sound in the monitoring area of the camera, you need to turn on the audio on the camera.
Applies to: All Reolink cameras which support the audio function
You could follow the steps below to turn on audio on the live view on the Reolink app.
Step 1. Log in to your camera and go to the Device Settings page.
Step 2. Go to Audio and switch on the Record Audio button.
Step 3. Click the speaker icon to enable audio.