If you can log on to your router, look for the HUE device to be a connected device. It's MAC address might start with 00:17:88
If you find it, or think you found it, you can unplug it and see if that device goes away. Now you know it is connected, and its IP address.
Open the hue app on your phone and try to connect to that IP address.
If you cannot find the device, reply with "it was connected in the past, and you // did // did not // make any changes to wiring or routers or reboot stuff.
Or it never connected since you put it in your house.
If not connecting, you could swap the ethernet wire with some other device that works, to see if the connectivity follows the port or device.
How old is it?
What happens when you try to add it to the app?
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