@not_insane 

Have you tried other modes like bridge? https://www.tp-link.com/us/support/faq/724/

@Tony 

I just started another thread on this. I did get it to work, but now, a couple of months later, Survey finds nothing. Looks like it failed. What a shame. It really worked well in repeater mode. I had it set up to the side of a garage door "looking through the window" at the point on my house where the wi-fi router was. It got a solid four lights on in signal strength and brought that in solid to the rest of that sheet metal building. Everything worked great.

Until it didn't.