Hello! I have recently came back to vrchat and I am still encountering the same problem from 1 month before i initially left… I can’t hear people or the world… If anyone knows anything… Please help me 
( EDIT: Im connected on my oculus ;0)
Make sure you have the right headset/speakers selected in Windows, maybe? That’s the output that VRChat will use.
Right click the speaker icon in the Windows system tray (bottom right), click Sounds, go to Playback Tab, right click your desired speakers/headset and set it as default device and default communication device.
There’s no option as default device
It’s just Oculus virtual audio device for both of them