The following steps is required if you are projecting Google Meet session onto the classroom projector over the HDMI connection.
Make sure that your laptop is connected to the patch panel in the classroom over the HDMI cable. Ensure that you can see your computer screen on the projector screen and volume is not mute.
1) Click on the "⋮" follow by "⚙️ Settings"
2) Change the Speakers option to any audio output device that has HDMI in its name.
3) Press "Done"