Currently, the Door Sensor state is not available via your Matter integration.
As with the HomeKit integration of the Smart Lock 2.0 and 3.0, the door sensor state is not supported and currently not visible via your Matter integration.
The Matter standard includes an optional feature for door position sensors (DPS) in the field of door locks. This feature includes various events and states such as the "Door open" or "Door closed."
However, since none of the Matter control centers on popular platforms like Apple Home or Google Home currently support this optional feature, it is also not yet available for the Nuki Door Sensor.