Play a sound file in a passage only

I am trying to play a sound file in one passage only. I am using the HTML5 to play it. It loads the file but it doesn't play for more than 1 second. I am trying to do this in Harlowe. I know the file is working because I can play it with the controls.

Here's the code I am using.

<audio controls autoplay loop>
<source src="sounds/soundeffect.ogg" type="audio/ogg">
Your browser does not support the <code>audio element.

Any ideas?  Thank you !