Auto-lock does not function despite the setting being enabled

The cause is one of the followings.

1

The lock (dead bolt) might be in contact with the strike. 
Please adjust the position of strike.

How to adjust the strike( DoorSliding door

 

 2

Auto-lock function will not activate when the door is unlocked by manual key or turning thumb-turn manually.
When the door is unlocked by electric means, the auto-lock function will activate when closing the door.