Some Kaltura videos and video quizzes are not working on Apple mobile devices if the device was updated to the latest version of the operating system, iOS 18. Kaltura is aware of the problem and is working on resolving it as soon as possible.
The work around for now is to not update your device to iOS 18, use an Android device, or use a desktop computer.
I apologize for the trouble here, but hopefully it won’t be too long for them to get this resolved.