For you guys who have never been to the Scottsdale center, it can be a bit confusing (at least I found it to be when I did our pick-up in Nov). Signage could be better.
You have to go into the room next to the service bay (to the right hand side of the lot). Help is scarce as they are trying for a "no-contact" way of working (don't work out so well...). You'll eventually find someone who will assist you, but it's likely no one will be in the room when you walk in. You'll have to snag someone coming or going from inside the office.
Enjoy your new Teslas!
Rich