@ShaneZampire According to TP-Link documentation (which sometimes is not up to date) Deco XE75 Pro should support feature called IoT Network, which is exactly what you need: separate SSID running on...

@msallam This switch has link status light, have you checked it is on? If you do not connect Satellite Deco units through the switch to Main Deco, if you only use switch to expand number of Ethernet...

@CAptain_Me When you turn off Guest WiFi in Deco app, that will reset its SSID and password. Try that. Also check if your M9 Plus keeps broadcasting 2.4GHz, this will be easy to check in Deco app....

@Andrasd You can only integrate into Deco mesh system from the list of Deco models. Deco X90 is top of the line WiFi 6 Deco, there is nothing in the list of Deco WiFi 6 models that is better than...

@AlexJPF Yes, you can do that. Router to which Deco are connected must support Deco Ethernet backhaul protocol, but most ISP Routers do.

@RAL24 You will not need to use Access Point mode.