Play audio when lightbox closes

I created a slide that plays an opening narration then opens a lightbox.  After the lighbox content closes, I want the slide to play a closing narration.  I can't figure out how to get the audio to play when the lightbox closes.  I tried using a Boolean variable by changing its value when the lightbox's timeline ends and creating a trigger that plays the audio media when the value of the variable changes but that didn't work.  Can anyone recommend an approach to getting an audio to play when a lightbox closes?

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