How to reproduce
- Add video using video resource / course element
- View video using an iOS device running iOS 10
=> Video does not play
This is caused by an iOS bug. iOS10 does not transmit the session id from the browser. This was already a bug in iOS7 but fixed by Apple in the versions in between. Now they managed to add the bug again.
See
http://stackoverflow.com/questions/19215098/html5-video-audio-player-on-mobile-safari-ios-7-ios-10-excludes-cookies
http://demo.bizify.me/fiddle/cookie/