Due and available dates should sync automatically between MindTap and your LMS. If due dates don't sync in a copied Canvas™ course, your new course might have Until dates that prevent changes. For other date sync failures, request a manual date sync in MindTap.
Copied Course Dates in Canvas
Cause
Your MindTap activity links have Until dates.
The Until dates in your old Canvas course were copied over to your new course. Since the Until dates have passed, you cannot update the due dates.
Resolution
Remove or shift Until dates on MindTap activity links so you can set new due dates.