About Video Content

All html5 videos are encoded in vp9 with libvpx-1.7.0 (or newer) and are in a webm container.

What does this mean? Why does it not work for me?

What this means is that the video should work on almost all devices EXCEPT iOS devices, embeded Microsoft devices (Windows Phone/Xbox etc...), and macOS Safari

How do I fix plz?

iOS

I don't have any iOS devices to try this on. But this should work for iOS

macOS

Don't use Safari, how about trying Firefox?

Microsoft Windows

Make sure you are using the latest version of Edge