If the car does not verify a button being pressed - move closer and try again.
The remote control key functions may be disrupted by surrounding radio waves, buildings, topographical conditions, etc. The car can always be locked/unlocked with the key blade.
If the remote control key is removed from the car when the engine is running or key position I or II is active, and all doors are closed, then a warning message is shown in the information display in the combined instrument panel and a short audio reminder signal sounds at the same time.
The message extinguishes when the remote control key is returned to the car, followed by a press of the OK button, or when all doors are closed.