Got myself into a corner case yesterday. Was at a friend's house in the boonies, and left the FOB in the truck. As I was walking out of the house to leave, I wanted to remotely start the truck (so it could spend a minute at high idle). I didn't have the FOB, so I used the app on my watch. Sure enough, when I got to my truck it was running. But the doors were locked..... and I couldn't get in. I tried to use my watch to unlock the doors, but the app on my watch just had the "busy" spinning circle. Not sure, but I think hitting unlock after a remote start messed it up. The unlock should probably be greyed out after a remote start. I was finally able to send a Cancel Engine, and after the truck shut off, I was able to send the Unlock doors.
Side note: I have the backup NFC card in my wallet. I completely forgot that I might've been able to use it -- so might try to recreate this again and try it.