$w("#audioPlayer") not working

Have a read of this page as it provides a solution.
https://www.wix.com/corvid/forum/community-discussion/playing-audio-dynamically-solved

The Wix AudioPlayer API was only introduced at the end of August, so there shouldn’t be an issue with it already.

With regards to the MP3 URL, how are they actually listed in your code for it?
https://www.wix.com/corvid/reference/$w.AudioPlayer.html#src
The URL formats supported are:

  • Media Manager: wix:audio://v1/<audio_uri>/#duration=

  • Web URL: (http(s)|blob|data)://site.com/audio-file.mp3

Also, as you are using a repeater are all your scopes set up correctly for it with onEachItem and onItemReady etc.
https://www.wix.com/corvid/reference/$w.Repeater.html

What plan are you on with Wix, as it could just a simple issue of your storage is nearly used up, thinking outside the box here.