I do not miss the myChevy App so I am not interested in long phone calls to activate it, especially since I do not pay for OnStarSupport put me through MANY updates, to no avail. I still did not have Public Charging on my MyChevrolet app. Ultimately, I needed to get in the car, push the OnStar button and have a "Welcome call" with them. I did not agree to have an OnStar subscription but they were able to do something to activate the Public Charging option on my app. So I deleted the app and reloaded it.
I use the Tesla App smoothly to use their NASC chargers with my GM supplied Tesla adapter