The app can be registered as a key to multiple locking systems. Additional locking systems can be registered in the same way as the first by following the steps described above. The Locking systems view, at the bottom of the screen, shows the list of locking systems where the app is registered as a key. 

In the Locking systems view, the first four locking systems are active, i.e., the locks in them can be opened with the app. The other locking systems on the list are in standby status. The first attempt to open a lock in a standby locking system will fail, but the app will then promote the locking system to active status, and the next attempt to open the lock will succeed.

Please note that a maximum of four locking systems can be active at one time. If a standby locking system is promoted to active status, the app will move one of the active systems to standby status.