So the ZEN04 is powered but unresponsive to commands from your app, is not updating status, or is showing that it's offline? This suggests a range or connectivity issue:

The ZEN04 Smart Plug is a 700 series Z-Wave Plus device that has range of up to 300 feet (line of sight). Even so, interferences like thick walls, large furniture, and metal or glass elements can shorten this range. A device's range is ultimately determined by the specific structure of your home and the strength of your mesh network.

Please try the steps below if you're seeing connectivity issues with your ZEN04 Smart Plug:

1. If there's a way to refresh your Z-Wave network, please try refreshing. This process will allow the hub to devise the most effective route to the ZEN04.

2. Try excluding and re-including the ZEN04 Smart Plug directly from the installation location, as it's possible that the hub hasn't found the most efficient communication route to the device. This sometimes happens if a device is included near the hub and then moved to the target location. 

3. Try bringing the ZEN04 Smart Plug closer to your hub. Plug it into a wall receptacle near the hub, and then exclude and re-include it. If the plug includes successfully, stays connected, and is responsive to remote commands, it's possible the previous location was out of the hub's range or there are too many interferences in that particular area.

If the plug is still unresponsive after trying the steps above, please let us know! We're happy to help!