My pre heating has been working on my Ehybrid for the last 3 nights by setting the departure time through the infotainment system not the connect app (i no longer have the app). So far so good as its been a lottery as whether or not I'd have a toastie car when i finish work at 6am.
As far as can figure, Android auto needs to be connected, and i switch off the engine whilst in the departure screen and it works, I realize it should just work without this but as the infotainment system on the car is so temperamental I'm sticking with it...Much happier now everything is working as it should and fingers crossed when the frost returns no more scraping
......I'm not confident that what I have done to get working will work for you or even that it will keep working but may be worth a try for others having the same issue.....I also have sneaky feeling that the departure time pre heat not working is a software glitch after the connect app expires