the desktop wont show the 5 ghz channel wifi
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i dont know what version i have. i havent done the reboot. just did the firmware. made the desktop a priority client. have it on two 2ghz and 5ghz due to some smart lights that wont work unless its like this. dont really want to put on one network. is there anything i can do to make the wireless desktop connect to the 5 ghz. i am going to try the reboot after the chat
This indicates to me that the DESKTOP is the problem?
So, what IS the Desktop and what IS the Network adapter in it? Is it capable of seeing the 5Ghz signal?
Where IS the Desktop located in relation to the Router's location?
If you look here for instance, 
(I can't post the link, TP-Link doesn't allow links off thier site) you'll find some help on the range of the SSID's. From it, this:
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A general rule of thumb in home networking says that Wi-Fi routers operating on the 2.4 GHz band can reach up to 150 feet indoors and 300 feet outdoors. Older 802.11a routers that ran on 5 GHz bands reached approximately one-third of these distances. Newer 802.11n and 802.11ac routers that operate on both 2.4 GHz and 5 GHz bands reach greater distances.
Because it uses narrower wavelengths, a 5 GHz Wi-Fi connection is more susceptible to obstructions than 2.4 GHz connections, and so will usually have a slightly shorter effective range, typically, 10 to 15 feet shorter.
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Basically the 2.4Ghz SSID will be stronger at distance from the router that the 5Ghz SSID. At some point it might not even be there? However, the 5Ghz generally is stronger than the 2.4Ghz SSID until it drops off as longer distances from the router.
Possible that this is why you can't see it, especially if in your case the 2.4Ghz SSID is on the weak side and is slower in speed than on other devices.