When a user joins the queue an audio notification is not fired.
Everything after Geneva. Audio notifications for Connect are not supported in Geneva. KB0597926
The property which enables Audio notifications when a user joins the queue "glide.connect.support.enter_queue_audio_alert" is set to false.
1) Navigate to sys_properties.list
2) Search for "glide.connect.support.enter_queue_audio_alert".
3) Set the Value to true.