@Blex I see. When I was adding X50-PoE nodes to my home mesh, I have found that when new Satellite is blinking blue, not Ethernet wired and is not far from Main Deco, and Deco app is simply open on...

@ferus Swap Deco units - that is the good idea. You can still try test I suggested with connecting one Satellite to another, but use short Ethernet cable. This is to confirm Ethernet ports in Deco...

@Blex Also, if you could explain what does it mean "The TP App does not "find" the new node even though it is pulsing blue and is visible to my phone" - how and where is it visible on your phone, if...

@Saadyc Sorry, but you have not provided enough information to help you with your issue.

@ferus It should be easy to test your theory on limit for Satellites with Ethernet backhaul: power off "Sam's room" Deco and if what you think is correct "Living Room" Deco, the only one Satellite...

@KM1967 Should not be a problem with adding M9 Plus to your Deco mesh of P7s. They are of the same Deco WiFi5 family, and M9 Plus has newer firmware than P7, meaning you should not be losing any...