It might be due to an output issue if you’ve connected an external device like speakers or headphones and can’t seem to hear anything. You can check if the output device is set to your connected device. If this is not set to the right option, you might hear the sound from your Mac instead of the headphones or speakers. Click on the Control Center icon on the Menu bar and open the Sound tab; from here, select your device's name under the Output devices section, and your issue should be resolved.