If your Mortise 2+ is not locking, it may be due to the following:

• Auto Re-lock is disabled
• The door sensor on the Mortise and door frame magnet are misaligned
• Low battery or wrong batteries used

If you have disabled auto Re-lock Mode, you can lock the door by holding on to the '#' key on the Mortise from outside the door, or hold on to the multi-function button from inside the door.