Dual Band AC-3165 5GHz Network

I'Ve just purchased a NUC5PPYH Mini Computer which comes with a Intel AC-3165 Wireless adapted installed, however when I try to set up it to use my WiFi network, only the 2.4GHz network is shown. The 5GHz one is missing completely from the list even though it states it supports dual band WiFi. I've connect to th 2.4GHz perfectly but can't understand why the 5GHz network isn't working even though it is on other devices. My wireless router is the latest Apple AirPort Extreme if that helps. I'm also running Windows 10 Pro too and installed all the latest Intel drivers.

Thanks