Nighthawk x8 R8300 2.4gHz wifi doesn't have a valid ip configuration error; 5gHz wifi connection ok

OK. Laptop errors are often down to Windows.Indeed, a Google search shows that the error you see

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gburn wrote:
When I run the window's troubleshooter, it produces the "wifi doesn't have a valid ip configuration" error.

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is pretty common, with various suggestions.

Wifi doesn't have a valid IP configuration - Microsoft Community

But you say that other devices can't connect. I assume that these other wifi clients can see the 5GHz SSID.

You seem to have tried most things. But as this is a router, I would try restarting the whole network according to the rules.

Be sure to restart your network in this sequence:

• Turn off and unplug the modem.
• Turn off the modem router and computers.
• Plug in the modem and turn it on. Wait 2 minutes.
• Turn on the modem router and wait 2 minutes.
• Turn on the computers.

Your router is still in warrant – it runs for at least a year –  so I'd start going down that road.