Can't hear audio when I hit Play on the timeline

Hello, I'm working on a new Storyline file that I created. Everything was working fine until recently.  Now, I can preview a slide and everything is fine.  I can publish the course and everything is fine.  But when I hit play on the timeline, I can't hear my audio.  This makes it nearly impossible to sync my audio. There are currently 49 slides in the file, no video.

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