Symptom: The Turnitin submission folder shows a date_post - post date must be after start date message.
Reason: You have set the Folder Open Date (in IVLE) after the Feedback Release Date (in the Turnitin submission folder settings). This happens usually where instructors create submission folders in advance, then change the Folder Open Date to a later date.
To resolve this issue, change the Folder Open Date of the Turnitin submission folder in IVLE to an earlier date (before the initial creation of the folder).
Try a date up to a year earlier.