Solved. A reset of the PLC did the trick (press the connect button for 15 seconds while connection it to the power)

Hi I have several TP Link powerline adapters. I have 8010P connected to my router, 2x a TL-PA8030P(EU) V1 and oneTL-WPA8630P V1. One of the PA8030P is showing up as an Unknown in the TP Link tool and...