Sound won't play in working file

I just did a screen recording + sound.  I can see that the recording has sound, but when I play it, there's no audio.  On a whim, I published the course and played it - the published course includes the sound.  I just can't hear it when I'm playing the recording for edits.  I've been using this software off & on for years and have never had this issue before.  I've checked my sound settings for playback, etc. and can't identify the cause.

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