YouTube Autoplay not working

It’s not working since April of 2018 because Google decided to give greater control of playback to users. You just need to add &mute=1 to your URL.¬†Autoplay Policy Changes

<iframe id="existing-iframe-example"
          width="640" height="360"
          src="https://www.youtube.com/embed/-SFcIUEvNOQ?autoplay=1&mute=1&enablejsapi=1"
          frameborder="0"
          style="border: solid 4px #37474F"
          ></iframe>

Update :

Audio/Video Updates in Chrome 73

Google said : Now that Progressive Web Apps (PWAs) are available on all desktop platforms, we are extending the rule that we had on mobile to desktop: autoplay with sound is now allowed for installed PWAs. Note that it only applies to pages in the scope of the web app manifest. https://developers.google.com/web/updates/2019/02/chrome-73-media-updates#autoplay-pwa

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