The stream embed only works on Full Guides. Your guide is currently too short to be considered a Full Guide, which is why the embed isn't showing up. You need at least 3,000 characters of body text (including BBCode) for Full Guide status, so you just need to add a bit more content to your guide and you should be good.

Thanks to Jovy for the sig!
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But my guide doesn´t show my stream.
I have everything set up on my profile linked to twitch etc.
My guide: https://www.mobafire.com/league-of-legends/build/9-1-sorakabro-s-guide-how-to-carry-as-soraka-543899
Hope anyone can clarify this issue thanks for your time.