Question :
Why can't I hear my audio on my phone using HikConnect but i can hear it on my recorder?
Answer:
After confirming you can hear the audio on the web browser and the recorder access the HikConnec app.
Select the camera so it takes the full screen, confirm the stream is set to HD and the volume is enabled as seen in the picture below:
Then increase the audio of the camera as the application volume may not be raised.