Start with the right checks.
The meeting can be open while its sound is going to a different speaker or has not been connected at all.
What to do next.
Check the computer volume and headset connection.
In Zoom, join computer audio if prompted. Open the audio menu and choose the intended speaker.
Run Test speaker and microphone and listen for the speaker test. Try a different available speaker if it is silent.
If necessary, use a telephone option provided in the invitation. Check any applicable calling charges first.
Check the result.
You can hear the test sound and then the intended meeting audio.
Stop and get help if…
No device produces sound or the audio option is restricted. Give support the device names and what happened during the test.