2021 Nissan Altima brakes problems

My car is supposed to have an automatic braking system/collision detection. Two cars in front of me slammed on their brakes and the car in front of me slammed on his brake, and I didn't have enough time to react. I totalled my car, but my car is supposed to have a safety feature that automatically brakes. The faulty automatic braking didn't engage as it should have.

The contact owns a 2021 Nissan Altima. The contact stated that while pulling out of a parking lot, the contact shifted into drive(D) and then to reverse(R) to exit the parking lot, and while driving 3 MPH, the brake pedal was depressed, and the vehicle failed to stop as intended. The contact attempted to forcefully depress the brake pedal; however, the vehicle failed to stop. Due to the failure, the vehicle crashed into another vehicle. The dealer was contacted. The manufacturer was not made aware of the failure.