I just went ahead and generated mine. I am an Associate Member and had joined in October of last year.
I used Bronco Sport. Only issue I had was getting stuck in a log in loop in Chrome, so I used Safari and I was successful. The PIN is good for a year.
My 63 is set up with an unlock sensor recessed into the handles towards the rear of the vehicle, so this will undoubtedly mess me up. One weird thing in MB's that annoys the crap out of me is, if you lock the key with the key fob, you cannot open it with the door sensors. You have to use the fob...