Change central locking with car keys

Hello, I’ve had problems with the comfort closing/opening of the windows to me the key and I’ve been told that you can turn it on with the car key yourself, this is now also possible after we’ve tried button sequences and lock sequences. Now, however, the problem is that if I want to unlock my car, only the driver door is opened and the others are not and I always have to press 2x on unlock to unlock everyone. Does anyone know what to do so that all doors are unlocked at the touch of a button? Thanks in advance