It's impossible to autoplay with sound on because of a limitation enforced at the browser level. Here's a doc that explains a little more. https://developer.mozilla.org/en-US/docs/Web/Media/Autoplay_guide
However, it's easy to autoplay your videos with the sound muted. If you're using our player, you can enable autoplay in a few ways.
Edit your player in the dashboard and set" Force Autoplay" to true.
Using our player SDK, you can instantiate the player and pass a config argument to autoplay. Docs here
You can also pass in an autoplay URL param to do the same with our embed URLs.