I have a Powerline Network Extender (TL-PA9020P) that connects my PC to the internet through an electrical outlet, and I just got a Powerline ac Wi-Fi kit (TL-WPA7517 // AC750) that I can't connect to the same network for the life of me. I tried connecting it using the WPS button on my router. Then, I tried downloading the TP-Link app only to find out the TP-Link I got wasn't yet compatible. 

I've tried following instruction that lead me to 192.168.0.254.

I tried other instructions that had me change some network settings and go to tplinkextender.net

I read multiple other threads and tried watching many videos to no avail. 

Ulitimately, I'm dumbfounded, properly lost and kind of on the verge of exasperation. 

I read the instruction 20 times over and I think it's clear I need some help. Can anyone help point me in the right direction to set up my (TL-WPA7517 // AC750) to my existing network?

My ISP is FIZZ and I have no idea what the issue is with my router's WSP, or why the extender doesn't seem to want to pair with its signal. I've tried clicking on the WSP followed by the "wifi" button on the extender, as indicated by the instructions. I've tried doing the inverse. I've tried holding the buttons for different amounts of time, and I've tried using the "pair" button instead of the "wifi" one as well. I've reset the extender to factory settings on multiple occasions, and I've tried doing all of the above when the two devices have been hardwire to one another and not. Like I said before, I have no idea why the signals aren't being sent and I clearly need some help. 

Thank you very much in advance :)