I graded a Turnitin assignment but the grades are neither available in gradebook nor visible to students. What is wrong?
Most probably you have graded the Turnitin assignment after "Post Date". Post date is the date when grades and feedbacks will be released to students. You need to grade submissions before this date otherwise the grades will not be shown in the gradebook. If the post date has passed, before grading edit the Post Date from Turnitin Assignment settings.