How do I get livestreams to work?

For livestreams, you need to leave the Synchronized Start Time and Display (Start) and Display (End) fields blank in the Advanced Options for Embedded Video. The synced TV function automatically moves the time dial forward or backward to ensure all participants are seeing the same part of a video and livestreams on Youtube do not have a time dial. YouTube already handles the video synchronization on their end, which means you only need to link the livestream as if you were embedding a regular video.