youtube handle

I am trying to secure a youtube @ that's not taken, but for some reason, Youtube won't allow me to secure it. No one has the handle because it goes to 404. Anyone has any idea what's happened with this?

Must be logged in to your Google account to see the details: https://www.youtube.com/handle YouTube is adopting handles like most other popular social media sites. This seems pretty important! Locking up a unique short or interesting handle can make your channel worth much more on the market...