Nikon Z 8 Reference Manual page 332

9
Select the camera in the Wireless Transmitter Utility.
Select the name displayed by the camera in Step 8 and click
[Next].
10
In the Wireless Transmitter Utility, enter the authentication
code displayed by the camera.
The camera will display an authentication code.
Enter the authentication code in the dialog displayed by the
Wireless Transmitter Utility and click [Next].
332
Computers: Connecting via Ethernet