Media Load Error

I am getting an error of “Media could not be loaded, either because the server or network failed or because the format is not supported.”

We do use W3 Offload S3 to serve all of our media files. Could this be limiting the video from playing? It encodes properly, but does not play in the browser.

https://cityofhanahan.com/notices/fire-department-training-video-2018/

The page I need help with: [log in to see the link]