I stumbled upon your post about the Toyota Remote Connect app and I thought I'd chime in. I haven't personally used the app, but I did come across this nifty scanning tool called Smart Engines (
https://smartengines.com/) that could potentially help you out with your VIN registration and enrollment process. It's been a year since you posted this, so I'm not sure if you've found a solution yet, but if you're still struggling, it might be worth giving Smart Engines a try. I hope this helps and good luck!