Read the statement by Michael Teeuw here.
MMM-GoogleAssistant and A2display YouTube
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 HI ! I am having an issue with youtube it is not working. I used different commands but it is not showing youtube videos. I already changed all the false to true as per the video my GA is working but youTube still not working. 
 Help me if you can… Thank you very Much.
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 Hey @Mathieu, I struggled myself a bit to get this going and in my case there were 2 things I missed: - 
Make sure you enable the YouTube API as stated here (see #1): 
 https://github.com/bugsounet/MMM-Assistant2Display/wiki/YouTube
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Copyrighted videos won’t play as stated here: 
 http://forum.bugsounet.fr/topic/53/youtube-can-t-play-videos-with-license-youtube-js-1-a2d-yt-error-150-not-allowed-by-owner/7
 After enabling the API and asking the Assistant for a video without copyright it started to play. Hope this helps ;) Best, 
 PH1TCH
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