Mikrotik powerline. How to setup?

Question

network hardware

hello.
How to set up this miracle? PL7411-2nD
out of the box is not connected by default.
Altered configs, assigned ip and routes. Everyone individually knows how to go to the Internet by wire.
How to start using not a wire, but a PLC on one of them?
I understand that the problem is with the hands .. I tried to press the sync button on it for 3-5 seconds. nothing changes.
On the first MT sync, the first 2 icons (power and up arrow) are on, on the second, nothing from sync is on

Answer 1

https://blog.set-pro.net/powerline-plc-%D0%B0%D0%B...
In short, in the interface in the PLC tab, you must specify the same Network Key on all the necessary devices.
At least it worked out of the box for us.