My delivery was last Friday, and the delivery specialist (home delivery) told me that it would take 2-3 days for the app to sync with my car. Fortunately, a friend who already has his 3 told me that during his delivery the specialist turned on remote access on the car UI.
I believe it was under Safety and Security, then click the gear icon in the right corner to click the radio button next to "allow remote access". After that my phone app sync'd up.