If you have trouble embedding a YT vid, check the url and remove anything from the & back if there's one in it. It tells the host that it was from an index and where or if it needs to start at a certain time…it's all admin for YT.
https://www.youtube.com/watch?v=ficae6x1Q5A&list=WL&index=1
https://www.youtube.com/watch?v=ficae6x1Q5A