Magento v2.1.9. I've added my YouTube API key into Magento, but I cannot play Youtube or Vimeo videos. It plays on the product setup page where I add the video. But only an image of the video is displayed on the actual product page.
The video I've added is actually from a manufacturer's YouTube account. So it's their product video URL on their channel. The video is not actually in my YouTube account. So I'm confused if the video is not playing because of a technical reason or if it's not playing because I'm not allowed to play videos from someone else's YouTube account.