This morning was a fail for me, I think. I left the car plugged in all night, 100% charged. Solid green light on the charger. Used the app to initiate pre-condition. And within a minute it started to warm up. Cool... I did not open any doors, just observed. Within a minute the car display indicated unable to charge. The charger indication stayed solid green. Does this mean its warming up on battery only? I waited a minute but the charge failure remained. Perhaps not patient enough?
If I recall correctly, I could turn off the warm up via the app, but that did not appear to work for me this morning. Maybe never did. Toggling the on off switch didn't stop the warm up. Selecting D and then back to P, then turning off the car stopped the warm up. Battery now at 97% indicated. After plugging the charger back in, it negotiated and topped off the battery.
So apparently warm up was initiated, but it was drawing off the battery.
I may be able to try again tomorrow and with more patience.