How do you stop alarm going off when using key to open door?

To stop the alarm from going off when using a key to open the door, ensure that the alarm system is configured to recognize the key entry as a valid method of disarming. This often involves using a specific sequence or code after unlocking the door with the key. Additionally, check if the alarm system has a manual bypass option that can be activated. If the problem persists, consult the alarm system’s user manual or contact customer support for assistance.