Hi,
As I do not know where you are connecting to, hopefully this will be of some help.
https://studenthelp.secure.griffith.edu.au/app/answers/detail/a_id/1832/~/my-assessment-has-been-marked-in-turnitin.-how-do-i-see-my-marks-and-feedback%3F
There is also this note on the page which might be relevant:
''Your comments/feedback and mark are available in the Turnitin document view after the Post Date has passed and if your course uses GradeMark.''