Charging on Tesla SC w/non-Tesla

For those whose non-Tesla EVs are now activated on TSCs, how did the process go with adding your car to the Tesla app?

Anticipating the 15-Jan activation for my EV6, I added my car to the Tesla app, but it didn't ask for my VIN. Also have the A2Z v2 adapter.

Once your car was authorized with Tesla, did the app ask for a VIN? Or did it make some assumptions based on the pedestal number you plugged into at a TSC?

What was the process?

Just wondering what to expect.