ISP cable modem to router ISP cable to WAN port in router? In internet browser http://192.168.1.1 and admin/admin of course in factory default. I don't understand what you mean "pin" (button reset)?

You connect a cable to the router?

Because you have Wireless Security for example WPA2, I know that some devices does not cope with WPS.

Switch off - Disble WPS in your router.

Maybe this is mistake in spelling on TP-Link page?

Maybe try with alternative firmware for your router (dd-wrt, Gargoyle, open-wrt). Sometimes this change gives a lot of.