You can toggle your Roll20 Video/Voice Settings beforehand to make sure you're all set up for when your players arrive. I recommend checking out the Roll20 WebRTC Features , too. In the event that you or your players are experiencing issues with Roll20 Video/Voice, your first place to seek help should be the Video and Voice Chat Troubleshooting wiki page . It wouldn't be a bad idea to skim through that page in any case. I hope this helps!