This question has already been resolved. The connection could not be established manually or automatically. I have already returned this device and paid for the service.
Greetings K.Wehrli

Devolo products are always compatible with each other, the only exception being the blue adapters (first generation). These are not compatible with the new (white) editions.

Important: The transmission speed is based on the slowest device. This means that the adapter here will only transmit up to and with 550mbit in the network.