SCORM

Have you tried setting g_bWarnOnCommitFail in your story.html file to TRUE?

See https://articulate.com/support/article/how-to-let-users-know-if-their-course-attempt-cant-be-saved-in-an-lms-in-the-event-of-an-error

This at least gives the student a warning that something went wrong - much better than the student not getting any notification at all and just losing their work.