The code in the Embed field is when you want to add it to a webpage you've created.
For example, some creators may want to set up a website to promote their watches, in which case the embed would add functionality for the website where that code is used. So you wouldn't have to go to Facer to see what the face does if that makes sense.
But yeah, it has to be on a line by itself. Not sure if that's what happened or not.
I've grabbed the url from the Share button (as shown above) as well as copying it directly from the address bar in my browser.