@Prof_HA 

It sounds like you wired everything correctly. As far as your phone I would forget the Deco network so it won't jump to another network to see if there is an internet connection coming from the EAP unit or try another wireless device.

As far as naming the network units the same, you will end up with a single wireless network, but it will not be a true mesh. That would not mean it is wrong, it is just knowing how your network will then operate.

So having two APs named the same will then have the decision fall on the client device you are using to determine which node to connect to. Some devices move to the other signal if the current one reaches a low signal threshold or until it disappears altogether. In a mesh network, the actual network nodes will recommend which to connect to.

If you start to notice that your signal is very weak when being next to the EAP, then the device you are using probably is still connected to one of the Deco nodes. Turning off and turning back on the Wi-Fi usually gets it to connect to the closest node.