Hi Kelly,
Thanks for you help. The scorm has been tested and is correct. I have also enabled LMS debug and I don't see any possible errors (I'm the administrator of the platform). The error is given by the incompatibility of these scorms with Moodle version 4.3 if the scorms have the option "activity completion" in moodle setted on passes or completed.
As Amanda writes: "the problem seems to be when the next activity has restrictions set to only unlock after the student has completed the previous lesson. It never unlocks. "
I think it's a very big problem that, at the very least, should be reported to users who create courses with a lot of lessons, a lot of scorm packages and who want to have the platform always up to date. It's causing me serious damage with many institutions using my courses, for example and I've to advice to return to the an old version of moodle (4.2 is ok).
Thanks