The connection key is the building. It is generated on the first gateway in that hotel. A new hotel gets a new key, and that key never opens another property.
Starting a new hotel. On the first LOKSCO Leak Detection Gateway, choose Start a new building, name the hotel, name the first room, press Generate, then Save. After that gateway reaches the internet, sign in here with the same key. Every extra LOKSCO Leak Detection Gateway that uses that key is another room: one valve, up to 15 leak sensors.