Audio doesn’t play in Chrome or Safari

I have just discovered that I cannot hear the audio when playing back an eLearning in Captive 2017 (Preview/HTML5 in Browser).  Likewise, if I upload it as a Scorm file to our LMS, it also doesn’t playback in Chrome.  However, I can hear it if I make Internet Explorer the default browser (instead of Chrome). Is there a fix for this as many of our users are using Chrome. Thanks in advance. Sharon