That indicates a visit to the nearest Tesla Service Centre.In my case, I’ve never seen the magic “P” appear to begin parking except twice in 3 years. Both of those times I was stopped in traffic awaiting a traffic light change, not trying to park. I’ve not once seen the “P” attempting to actually park. And yes, I’ve read and complied with the manual‘s instructions and guidance from many forum members who have successfully used it. I’ve also had another owner for whom AutoPark at least occasionally works drive my car and try to AutoPark in places where her vehicle has no issue. No joy.
The most common mistake is not to drive far enough past the parking spot. Perhaps the Autopilot needs to see the rear end of the car next to you in its rear-viewing camera, but that's just a guess.