And this is exactly what I told a friend of my to do when he installed a public car charger. Before he told anyone it was live, charge his car using his normal customer account. Turned out he couldn't create one because his phone was already in as a supplier.

After some eye-rolling he agreed to buy a burner phone, add a prepay SIM, and whaddayano the bloody charger did not work. Two months later it works, for most people, who have recent cars that are not Teslas. Sigh. "welcome to our product, you're a beta tester. Maybe an alpha tester. We hope it works!".