Audio not playing on Mac, Safari version 12.0.3

Thanks for the reply and I understand the Safari security changes as well as Chrome.  My problem is that the first 3 slides are video, then the fourth has audio on the timeline.  I'm trying a work around to have the user click another play button when they reach this slide which is kind of wonky.  I'm also concerned for other slides that have audio on the timeline.

We are also going to test if we put an audio clip on the first slide along with the video, that the play button will cover both throughout the training.