Youtube Hero Video not playing - getting blank white screen instead of the video

Revolution Slider Youtube hero video is no longer playing. We have a full purchase of the plugin (not just the bundled version from the theme) and are using Version 21.8.1 for Betheme. The slider does not play on the header for the page, or as an item in Muffin Builder. No matter where the slider is displayed on the site, it is a large white space instead of the video. Youtube video link is functional (have tested this and confirmed Youtube settings).

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