Try rejoining on incognito/private window. Sometimes certain browsers extensions can block off audio.
Safari: On the latest version of Safari, you might face issues in hearing others as Safari disables audio. To enable audio go to Safari > System Preferences > Auto-Play and select “Allow All Auto-Play” beside vstudio.live.
Chrome: Go to Settings > Privacy and Security > Site Settings > Click on vstudio.live > Reset Permission > Make sure the “Sound” option is set to “Allow”.