@TP-Link I tried that, once again the garage has just connected to one of the other decos via WIFI as can be seen in the updated map: This is really frustrating. My TPLink powerline socket adapters...

I have included a map of the setup here, with notations to show that the P9 in garage is using M5 as source, so cannot be using Powerline backhaul. Any ideas how to debug this or get it working?...

I recently purchased Deco P9 (x3) units to replace a mix of M5 and a powerline adapter (tplink also) to get connectivity in garage. The old powerline adapters worked great, but wanted wifi instead,...