Sharepoint Playing a video showing as Clipchamp

Hi All, Up until about a month ago, our teams were able to play a video by double clicking on it in there sharepoint home page. Today, I have the entire team not able to play the video. The error they are getting is "This video is not supported for playback.” The permissions haven't changed for the site access, it is not using AC3 for audio or HEVC/H.265 for video. It is an MP4 video, under 125mb, and 1280 x 1020. 

I have tried the suggestions in this thread, but they didnt work - 

https://learn.microsoft.com/en-us/answers/questions/5541267/video-in-sharepoint-will-not-play

If I download the video it works,

If i switch to classic SharePoint, it works. 

Any suggestions?

Thanks

Mike