does the video play on youtube ? are you sure the video itself isn't broken?
You need to only put the letter/number combination that comes in the link in the YouTube tags
I'm on my phone right now so I can't give an accurate example but your link will look something like this youtube.com/e43fje3 (probably something before the numbers/letters etc) just copy /paste the letter/number combination at the end of the link inside the YouTube tags and it should work