I have created a Nissan account (the US one) and followed the instructions that I found in this link: http://www.jnauto.com/hybrides_lien_carwing_usa.php
. The instructions are in French and are from a car dealer here in Quebec that sells imported Nissan Leaf cars. It's pretty much written to contact Nissan USA, ask them to link the car to your account by providing them with your VIN and a proof of ownership, and most importantly write Vermont with the specific postal code as your address. I assume they chose Vermont since maybe it has something to do with proximity of Vermont to Quebec and that it would allow the car to "connect to US towers". So I followed the instruction to the letter but in vain. The car still shows a crossed out symbol on top right of the screen and I still can't connect to Nissan Connect.
Just on a side note, I received my car without the maps sd card. The dealership I bought my Leaf from is supposed to mail it to me shortly. So I was thinking that maybe me not being able to connect has something to do with that, unlikely but hopefully that's the issue.