I really tried everything, see below - units are connected with a single cable (I tried several ones) and yet they still connect via WIFI instead of wiring. (the third unit is completely turned off) I

@Alexandre. 1. I tried even without the switch, connecting the two units directly together. 2. I tried even different cables. No luck Is it possible that there is some bad settings?

@michaelmit i think i have the very same issue here: https://community.tp-link.com/en/home/forum/topic/786384 It seems to me that the main deco cannot output the connection via LAN 😢

I have three Deco M5 units, the main unit is set as router connected to the internet. The other two units are connected to the main unit via switch (I also tried without switch). My issue is that the...