I built my project using Unity 2021.3.8. Later in the course, you’re instructed to build your game using WebGL so you can upload and share it. As it turns out, more recent versions of Unity have a bug when it comes to playing audio clips within the timeline. You can find the bug tracker here.
When I ran my game in WebGL my version of Admiral Slackbar (Captain Guy if you’re interested) would pop up but no sound clip played. I believe this was due to the bug. I got around this by just pulling my audio files into the scene (I nested them under Captain Guy but I don’t think that’s necessary) and then used another control track to enable each clip.
Hope that helps someone 