As of August 2019, Google has updated its auto-play policy which has affected any Chrome devices that aren't being managed with a Chrome device management license to disable being able to edit or change the autoplay settings for sound. Any devices that are being managed by a Chrome device management license will not have this issue. You can also read more about how Google’s Autoplay Policy affects ScreenCloud users by clicking here.

To learn how to set up a device with a Chrome Enterprise or Chrome Kiosk license, read this guide on how to set up your device in Kiosk Mode with ScreenCloud.

If you are using ScreenCloud on a Chrome device (which includes Chromebits, Chromeboxes, and Chromebooks) you may experience YouTube videos or other videos playing without sound. This will occur if you are using a Chrome device in standard mode or standard kiosk mode. This will also occur on Windows or Mac devices running the Chrome extension. But if you are running a Chrome device in kiosk mode with kiosk mode set up using Chrome device management with a Chrome Enterprise or Chrome Kiosk license, this issue will not occur.

The reason this issue occurs is an Autoplay Policy that Google set some time ago, which you can read more about here. Google's Autoplay Policy affects auto-playing videos in Chrome and in order for YouTube videos to work properly you will need the enterprise policies that Chrome device management with a Chrome Enterprise or Chrome Kiosk license enable.