I can't hear in video meetings.
In windows:
Check sound settings on a WIndows PC
- Select and hold (or right-click) the Speakers icon on the taskbar,
and then select Open Volume mixer. ...
- You'll see a set of volume controls for your devices. ...
- Check your device properties to make sure that your devices have not been disabled by mistake.
On a Macbook:
Change the sound output settings on Mac
On your Mac, choose Apple menu 
> System Settings, then click Sound 
in the sidebar. (You may need to scroll down.)
-
Click Output on the right, then select the device you want to use in the list of sound output devices.
All sound output devices available to your Mac are listed, including the computer’s internal speakers, devices plugged into your computer’s sound port (
), USB speakers, and AirPlay devices.
For any device plugged into the computer’s sound port, choose Headphones.
-
Do any of the following to adjust your sound output settings:
-
Adjust the volume: Drag the Output volume slider.
If you have Sound in the menu bar, you can turn the volume up or down from anywhere.
To set a volume for alert sounds, drag the Alert volume slider in Sound Effects. The alert volume is relative to your computer’s volume, so if you lower the computer’s volume, alert sounds also play more quietly.
Stop sound output: Select the Mute checkbox.
Adjust the balance: Drag the Balance slider.