play() failed because the user didn't interact with the document first - on click event using Vimeo API

Question

I'm assuming an onclick event counts as interacting with the document, so not sure why an autoplay error is being thrown

Uncaught (in promise) NotAllowedError: play() failed because the user didn't interact with the document first.

const playbtn = document.getElementById('playbtn');
const player = document.getElementById('video-player');
const vimeoPlayer = new Vimeo.Player(player);
playbtn.onclick = function() {
  playbtn.style.display = "none";
  vimeoPlayer.play();
}
vimeoPlayer.on('pause', function() {
  playbtn.style.display = "block";
});
vimeoPlayer.on('play', function() {
  playbtn.style.display = "none";
});

i {
  position: absolute;
  color: white;
}
.fa-play-circle {
        display: block;
        position: absolute;
        left: 50%;
        top: 50%;
        font-size: 20rem;
        -webkit-transform:  translateX(-50%, -50%);
        -moz-transform:     translate(-50%, -50%);
        -ms-transform:      translate(-50%, -50%);
        -o-transform:       translate(-50%, -50%);
        transform:          translate(-50%, -50%);
        z-index: 2;
        color: white;
        color: rgba(255,255,255,0.75);
}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<script src="https://player.vimeo.com/api/player.js"></script>

<div id="video-outer-full">
  <div id="video-inner">
    <i class="far fa-play-circle" id="playbtn"></i>
    <iframe id="video-player" class="video" width="560" height="315" src="https://player.vimeo.com/video/309741585" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
  </div>
</div>

Answer 1

I was missing allow="autoplay" in iframe's attributes

<iframe id="video-player" class="video" width="560" height="315" src="https://player.vimeo.com/video/309741585" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen allow="autoplay"></iframe>