If you are receiving this message you can:
Refresh your browser (F5 on PC’s and Command+R on most Mac’s) being sure to reconnect your audio/mic. If you are using audio via WebRTC (the words ‘[ WebRTC Audio]’ appear in the lower right-hand corner.
If you continue to receive this message, you can choose to join audio using Flash. To join using Flash select "no" while in the audio test window:
Next be sure to "allow" the Flash audio permissions:
Then follow the prompts to complete the Flash audio test.
If neither connecting directly through WebRTC nor through Flash is working, you may be connected through a secure network that is restricting the WebRTC audio connection. In this case, it is best you join “Listen only”.
In some meetings, you’ll find the dial-in numbers in the chat welcome text. Scroll up through the chat window and look for text in blue.