Nikon Z8 User Manual page 861

Router Frequency Band
Choose the band for the selected SSID when connecting to a
wireless network in infrastructure mode. Select [2.4 GHz/5 GHz]
to connect to networks operating on either band.
When the camera searches for networks active in the vicinity, it
will list only those operating on the chosen band or bands.
The band is listed to the left of the network SSID.
If you select [2.4 GHz/5 GHz] when connecting via wireless
routers that operate on both bands, the list will include the SSIDs
in the band or bands detected by the camera.
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G button U F network menu
Router Frequency Band