EX6150 - 5GEX option not showing up on list of available networks on 1 of my laptops

I have a Netgear AC1200/R6220 router and a Netgear AC1200/EX6150 Wi-Fi Extender. I also have 2 laptops running Windows 10.

When I go into Settings > Network and Internet > Wi-Fi, and click on "Show available networks", only one of the laptops shows both the 5GEXT and the 2GEXT network connections. The other laptop only shows the 2GEXT network option. I want to have both laptops have the 5GEXT option. What do I need to do the make the 5GEXT show on the 2nd laptop?

Many Thanks,

Jonathan