Step-by-step instructions:
Select the three dots in the bottom right corner of Google Meet (you might need to hover your cursor near the bottom of the window)
Select Settings
Under the Audio tab, select the Test button
If you hear audio from the test, then there is something wrong with the other person’s microphone (you could send them this link [Check Microphone Settings] to help)
If you can’t hear audio from the test, then try selecting a different speaker option and select the Test button again.
Plug in or connect a Bluetooth Headset