You can add the network key to your configuration.yaml under the zwave: label.
zwave:
usb_path: /dev/ttyACM0
network_key: "0x49, 0x43, 0x1D, 0xBD, 0x03, 0x6D, 0x9D, 0x8C, 0x39, 0x67, 0x16, 0x82, 0xA8, 0x67, 0xEE, 0x91"
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