Grove Sound Sensor Cannot Detect Sound

Hello! I just started playing around with the raspberry pi and not very familiar with the environment yet. Does anyone know why my grove sound sensor cannot detect any sound? I’ve tested my sensor with many types of sound, but still, it doesn’t detect anything. I also used another grove sound sensors for the testing but they still produced the same results. The coding that I used for the testing was from the grove sound sensor documentation (grove_sound_sensor.py)