The GM should check under their Settings on the gear-icon, in-game. Make sure that the Voice feature is enabled on the drop-down. Wiki documentation, <a href="https://wiki.roll20.net/My_Settings#Video_.2B_Voic" rel="nofollow">https://wiki.roll20.net/My_Settings#Video_.2B_Voic</a>... If this does not fix it, please post again and I'll provide the technical issue troubleshooting guide links. Please view and follow all of the instructions on the Audio Visual Troubleshooting wiki page, it should help you. If the wiki does not solve your problem, head back over to this thread and let us know any additional details to help us further figure out your issue.