I can confirm Edge is the issue, we had the same and raised it with Support.
Edge has an issue playing HLS content, which came about after the upgrade to 1903 Windows 10, and the new edge browser.
This was annoying for us as I want to use the built in Windows 10 kiosk feature along with meraki video wall which means there are no logins, no other actions available apart from automatically logging into a local user and being tied down to a store app, edge in this case tied to the video wall only, brilliant, when edge works again!
For note, I’ve tested the new beta edge version and it is working again, just need to wait for the next version of Windows 10 for the new ‘standard’ edge.
We’re using chrome for now but it’s such a memory hog!