BUG in SL3 - Course works on Desktop NOT on mobile devices

Hi there,

I am quite clueless. My course is working on desktop but not on mobile devices like on a iPhone 6, Samsung S7 or Samsung Tablet Galaxy Tab S2. On these devices it is not loading on or after first slide. Loading bar is been shown endlessly. Reload shows the same result.

Could you just test it on both and give me a notice here in the thread?

Course-Link is here (type any random mailaddress and date to proceed):
https://cloud.scorm.com/sc/InvitationConfirmEmail?publicInvitationId=87908e43-4ee9-4fd8-87b1-e37d8564f6e4

I published it as a xAPI-file, not SCORM. 

I am considering to raise a ticket because this technical problem costs me tons of hours as I am trying to find the cause.

SL-file is here (click link at the bottom so you don`t need to create an account):
https://www.dropbox.com/s/4o4zfl1e6v3s7yw/Course_not_working.zip?dl=0

BR,
Thorsten