Here's a tip....

When you look under a Youtube video you will bneed to click on "Share", the new Youtube format provides a shortened link, something like this: youtu.be/LO0IVvXhl6g
These links with "youtu.be" do not seem to embed on the forum.
If you click on the link marked "Show Options" you will see a box to check for a "Long Link". Then you will get a link that looks something like this "youtube.com/watch?v=IQIv8OyGRRY" and this link will embed here on the forum.