Detergent Door Doesn't Open During Wash Cycle

The detergent door doesn’t open during the wash cycle.
What parts would I need to repair. Would the Detergent Cup Assembly part #AP4111571 be all I need? Or would I need more parts such as:
Detergent Cup Repair Kit part #AP4111544, Cover-Seal part #AP4110669, or a Gasket part #AP4307169? I just don’t know what parts are needed to get the detergent released during the wash cycle. Your assistance is deeply appreciated.