Thank you - so these are the wires here in my post. I followed the app and connected A (BUS+) to the right of the clip and then connected the Nuki Yellow and Red cable to the left port.
Then connected the black cable to port B on the VT42, and the Green and Orange to Port A.
As I mention in the post, I was told E is the apartment door and nothing is connected but that is the one that is triggering the front door.