If you are not using a Drum Map the the output from the AD 2 midi track should point to Addictive Drums 2
If you are using a drum map open Preferences (P) > MIDI > Drum Map Manager check the output port is pointing to AD 2. If not, select the first output port Hold down both the Shift and the Ctrl key, click on the arrow in the right of the output port select the Addictive drums 2 Port from the list, this should change them all. It may have a number in front of it that refers to the Track number.