Toggle Play button mid-scene

I have a slide that plays video narrative for half the scene, then pauses the timeline until the user clicks the button. While paused, I do not want the user to be able to avoid the button by pressing Play, so I've used javascript to hide the play/pause button in the player. However, I've been unsuccessful getting the button to reappear when the slide resumes.

When timeline reaches cue1, execute javascript:

document.getElementById('play-pause').style.visibility = "none";

When timeline reaches cue2, execute javascript:

document.getElementById('play-pause').style.visibility = "inline";

If I do a slide with only these triggers and no other slide functionality, it works. But, using my actual slide with animated shapes and click triggers, it's ignoring cue2.