WP Audio Player's autoplay not working?

I’ve installed the WordPress Audio Player on my website (not a WP blog) and followed the guide from here: https://wpaudioplayer.com/installation

I can get the audio to play fine but I want it to auto play when the page loads. It says on the FAQ page that to autostart I need to add this:

[audio:https://www.domain.com/path/to/your_mp3_file.mp3|autostart=yes]

But [audio:… isn’t in any of the code. All I have which refrences the .mp3 file is this code:

<p id="audioplayer_1">Alternative content</p>
         <script type="text/javascript">AudioPlayer.embed("audioplayer_1", {soundFile: "https://www.domain.com/path/to/your_mp3_file.mp3" });
         </script>

So I added |autostart=yes after .mp3 so it became {soundFile: "https://www.domain.com/path/to/your_mp3_file.mp3|autostart=yes" });

But that didn’t make it auto play. Where do I add |autostart=yes ?

Any help would be really appreciated.

Thanks,

Dan