Mini Survey - No Track ID Found Error

 Hey,  for some users I get the “Failed to submit questionnaire because no Track Id was found.” – Error. For other users it works just fine. When debugging, I can see that the Input Submission in fact does have a track Id, the problem seems to be when trying to retrieve the Tracker.  Can someone help? Why is it working for some users and for some not?  Thanks in advance!  
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