@LiaLin Also, one more question: what is switch brand name and model number?

@neilbaker86 To make sure everything is fine with your Deco mesh setup in general, question: did you name your Satellite Deco as "Deco_71A0" and "Deco_7434?" Because, usually if everything is right,...

@LiaLin This is unusual, especially for Deco mesh running in Access Point mode. Just to make sure I get everything right, two questions: 1. If you power off two Satellite Deco, will remaining third...

@LiaLin Do you run these in Deco default Router mode or in Access Point mode? Also, check this TP-Link FAQ, and in it Section Q2: General questions about Ethernet Backhaul feature on your Deco

@Synfalle This should work, unless the switch you use does not support Deco Ethernet backaul protocols. More about Deco Ethernet backhaul is here: General questions about Ethernet Backhaul feature on...

@BottleTiger Try it diffrently: add X55 as Satellite Deco. After that, promote Satellite X55 to Main Deco.