I need to remove my wife's iPhone from my Tesla's connections, but I've tried at least four times (including one after a scroll-wheel reboot), and all I get is a minutes-long spinning dial and a return to the bluetooth screen with her iPhone displayed prominently.
This is a 2016 Model S 75D MCU1 running 2020.36.11.
I had the same problem..The first time this happened to me I powered off the car. The second time it happened, powering off the car didn't correct it. So, if you haven't tried powering off, try that it "might" work.