@mlj In your network setup, Satellite Deco will not send Internet traffic through Main Deco. Satellite Deco will send Internet traffic directly through Archer vr2800 modem router. It does not matter...

SHINIGAMI26 wrote im also having this problem i currently have 3 m5 and client preference was working before the latest update.i reverted back the firmware prior to the latest update. now its back to...

@no6 If you definitely want to have WiFi 6E capable Deco, that limits selection quite dramatically, but these are more expensive. Do you want WiFi 6E, or can settle for just WiFi 6?

@Pairis It is obvious that powerline link works for you better than having Deco mesh without it. There are no powerline capable Deco models which support connection preference. Yet, there is another...

@Pairis It means the fact that you have P9s in your Deco mesh is what causing this error when saving Deco M5 configuration. This sounds illogical, but I know of two other cases with the same end...

@Pairis According to TP-Link Support all Deco nodes in Deco mesh must support connection preference feature, otherwise you'll see this error message.