Embed Video in Knowledgebase

Hello, there. I see a post from 7 years ago asking this question. The reply was that a video could be embedded via HTML. I have tried this a few time but this fails. When clicking the embedded video  I get an error saying the content is blocked - contact site owner to fix  the issue. These links work throughout other modules such as leads and accounts. I'm just curious if anyone else has had this issue and if so, how I resolve it. 

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