Gen 2 SimpliSafe on Basic App Control
I have the same exact problem. I live in a gated community and de-activated my service choosing to manage my system through push notifications only (free service). Unfortunately, when you do that, you are unable to assign names to your devices or change the names of any previously assigned devices. They're basically locked for life; so, if you move a motion sensor (for example) that was previously named "back patio" to another room in your old home, it's still going to have the name "back patio" for push notifications and you can't change that. And when you go to the Simplisafe App, you will only see the serial number of the device under your device listings, and will be unable to change the name there. It's Simplisafe's way of saying "buy our plan or else". Considering switching over to Ring (have Ring cameras anyway) where they don't play these kinds of games with customers who buy their systems.