When including Z-wave devices, they may appear as zw_0_0_0. This means that there is an incomplete inclusion and that the device must be added again. Tap ⚙️ settings → delete → put the device in inclusion / exclusion. Try inclusion again.
The reasons for this can be many, but the most common are that battery devices fall asleep or that there is too weak a signal between the device and the Smarthub. If this happens repeatedly, it is a good idea to move closer to the Smarthub. You can also try to keep the battery device awake during inclusion. Once the device is found, you can wait approx. 20-30 seconds and then put the device back in inclusion mode.