Sounds like you found the issue, it took me a little bit to realize the button on the front doors is purely for locking. Unlock by putting your fingers at the back of the handle for a moment, which unlocks the door.
The passenger front requires you to pull the handle to unlock however.
Also, in Unconnect settings, you can do some custom stuff. Such as whether only the driver's door unlocks or all the doors unlock when you unlock the driver's door. Also, when you press the lock button, you can set when the horn sounds. Default is the horn goes off after the first lock, which pisses off my neighbors. You can turn it off completely, but I prefer the 2nd lock, which means if I'm at a parking lot I can double check and make sure my doors are actually locked by hearing the horn go off after locking it again.