Microphone option not working on embedded interactive avatar

Hello! I have embed our custom interactive avatar on our online course page using the html code. The issue is that it is not possible to talk to the avatar, only use the text field. There is a button for microphone that says "click to speak" but nothing happens when I press that. I have tried embedding it on a two separate sites and use different browsers but this issue persist. I have the "allow microphone" option on so that doesn't explain it. Any thoughts?