First check that the Powerline adaptors are compatible with HomePlug AV standard. If they are not compatible with HomePlug AV standard then they will stop the Powerline network from working properly.
If the adaptors are HomePlug AV compatible, then the Network Password needs to be the same as that used by the Powerline Sockets. The Network Password for Powerline Sockets defaults to HomePlugAV. Alternatively, you can change the network key on all Powerline devices to something more secure via the respective software.
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