action type = 3 for unlatch or open door.
Please ensure the correct setting for your door handle, that can be set up in the Nuki app (i.e. Lever, Knob or bar or Lift-up handle).
What’s the setting for the door in Nuki App? Does this match the door you have?
You can check this in Nuki App under Features & Configuration > General > Choose door fitting
(attached screenshot below for your reference)