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I've found it works best by turning off wifi then opening the app and waiting for it to connect to the car. When I jump directly to summon before it connects to the car it never seems to connect. Patience is the key in my experience.
I visited Detroit this weekend and had it enable once I crossed the border. You need to reset your expectations as it is not auto lane change. It will prompt you to change lanes and then you can hit the gear select or turn signal and it will initiate. In its current state it is not that...
Ordered my set this morning and got a call this afternoon from Tesla advising they would arrive the end of October. They have a company that will come to my house and swap the wheels for me. Super convenient!