Video does not play on mobile devices however it does play on desktop [duplicate]

I’m trying to have a short video play in the background of my website just the once. the video plays fine on chrome when viewed on desktop computer however when view on a mobile device in chrome/safari it does not play.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
  #background-video {
    position: fixed;
    align-items: center;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    right: 0;
  }
  </style>
</head>
<body>
  <video autoplay muted id="background-video">
    <source src="BGVid/backgroundVid.mp4" type="video/mp4">
    Your browser does not support the video tag.
  </video>

  
</body>

</html>