Now the ISP router is connected to WAN port of R470T+? You may have to open ports or DMZ to change NAT type.

There is an IP conflict. Change E470T+'s IP to 192.168.2.1 or change your DSL router's IP address.

Are you using the built-in driver of Windows 10 or driver for Windows 8/8.1?

Hi guys, You can download the latest driver for Windows 8.1 and update it. It will solve the problem that you can detect 2.4GHz Wi-Fi only. http://www.tp-link.com/en/download/Archer-T2U_V1.html#Driver

Your WN822N is V2? Try the driver for Windows 8 or 8.1. http://www.tp-link.com/en/download/TL-WN822N_V2.html#Driver

If you press the WPS/Reset button for more than 5 seconds but no response, it should be a faulty unit. Get a replacement under warranty.