Some browsers can block autoplay when the user does not click on the screen or click on any button. To avoid this limitation autoplay is used without sound. From the version 8.46 this option is enabled by default
Custom unmute button
To improve interaction with the user, you can make a special element that will enable sound.
Video version of this guide on YouTube
In PRO you can add custom elements, for example.
See how it works in this template.