Help about configuration Powerlines

I tried to set my couple Tplink Powerline TL- WPA4220KIT but i didn’t have success.
I followed two provided methods you have on user manual (wps way and another method) but definitely I got that is impossible to obtain ip.
I tried to use ethernet connection to exclude wifi issues but it’s a problem that concerns the ip on lan.
I setted dhcp enabled on router and the status of three leds are what that indicates Power on, Poe on but third led is off…
I also followed a guide downloaded from Tplink website to solve this issue but i didn’t.
What do you suggest me?