https://www.youtube.com/shorts/<xxx>, do https://www.youtube.com/watch?v<xxx>
https://youtu.be/<xxx> which works just the same, but is shorter and easier to edit
It doesn’t like =<
I wonder if that’s a bug or not. Either way if you remove the < it should work
https://www.youtube.com/watch?v<xxx>
https://www.youtube.com/v/<xxx>. It’s the old video link structure, but it still works just fine.