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Took 24+ hours for our X to show up on the app. Our DS said it would show up the next day. Yes, seems ridiculous that it's not available at delivery so you can test stuff. Anyways, patience.
Tesla doesn't want you to be remotely honking the horn and turning on the lights while the vehicle is in transport or being prepped for delivery. Scares the hell out of their employees. They turn it on at delivery, and it takes some time for their servers to propagate the change out.