If you would allow papers submitted after the due date to be reviewed by peers, make sure that the following two settings are selected.
On the Turnitin base paper assignment "Add/Modify Turnitin Assignment" page, expand "Optional Settings" and check Yes under "Allow submissions after the due date."

On the PeerMark assignment "Add/Modify Turnitin Assignment" page, under "Base Assignment," check the checkbox for "Allow papers submitted late to be included in peer review."

Now a paper submitted by a student to the base paper assignment after the due date will be reviewed as long as a peer starts the review after the time of the late submission and before the due date of the PeerMark assignment.