Our customers are reporting that SCORM video playback doesn't work on the mobile app since the update to iOS 15. Either the videos aren't playing at all or the video freezes while the audio plays normally. I suspect this is related to this thread in the Apple developer forum:
One of our customers provided us with a SCORM package for which the problem happens so that you can test it. I can't test it personally because I don't own an apple device. You can find the package attached.