Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
After the Youtube app update from a week ago, LiveChat option is missing from live streams on Roku3 -4200X. I have checked for system updates, app updates, restarted the device several times. Also tried uninstall, reinstall app.
For more information about that channel's features and functionality, you'll want to contact Youtube support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.