It’s a localization problem, Facebook is loading a who-know-where javascript sdk to embed the video. Switch to code view inside your wordpress editor and search for the js include url, similar to https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.5 this, and change whatever string appears instead of en_US with en_US.
Where the string is located depends on how you are doing the embedding.
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