There is group submission functionality using the Handin assessment tool. It is not possible to have group submissions through Turnitin.
Guidance on setting up a group assignment in Handin.
Where a group assignment requires plagiarism checking (which is not possible through Handin), there is a workaround:
Create two assignments, one in Turnitin and one in Handin. The Turnitin assignment is used purely for getting the similarity score / report. Grading and feedback happens using the group assignment functionality in Handin.
The Handin assignment should be set up as a group assignment
One person from each group submits to both assignments at the same time.
When Turnitin grades are released (on pre-defined grades release date) no grades will be available.
When mapping the assignment to an assessment item, the Handin assignment is used.