The contact owns a Nuna Car Seat, Model Type: Rava, Model Number: CS05103CVR, Manufactured Date: November 28,2019. The contact stated that the harness buckle was difficult to release while attempting to remove the child from the car seat. The contact received notification of NHTSA Campaign Number: 24C002000 (CHILD SEAT); and received the parts for the recall repair. The contact still experienced failures with the harness buckle. The manufacturer was not made aware of the failure. The car seat was not repaired.