Error - unable to acquire LMS API

Intermittent issues are often the most difficult to diagnose. In this case, it sounds like Safari may be silently discarding or reloading the course page. When that happens, Storyline attempts to reconnect to the SCORM API, but the original LMS launch context or parent window may no longer be available. In other words, Safari may be terminating or reloading the Storyline content and then restarting it outside the original SCORM runtime environment.

Here are a few things I would definitely try:

1. Are you seeing any "Access Denied" or other errors in the browser developer tools? If you don't have access to a physical iPhone and Mac for testing, you could use BrowserStack to simulate the device and inspect the console logs.
2. In Storyline's publishing settings, do you have "Launch player in new window (creates launch page)" enabled? If so, try disabling it and test again.
3. On the affected device, try temporarily disabling Prevent Cross-Site Tracking in Safari > Settings > Privacy and see whether the behavior changes.
4. Pause any ad blockers, content blockers, or privacy extensions. Also, make sure both the LMS domain and the course content domain are whitelisted.
5. Can you associate the crash with any specific media, such as MP3 audio or MP4 video files? Also, does the issue occur more frequently when navigating quickly between slides or quiz questions versus moving through the course at a normal pace?