Devolo Remote Switch MT:2652 is shown as unknown device

Hey openhab friends,

iam new to openhab and just installed openhabian for my first time. The first steps were easy but now iam struggeling with the zwave device MT2652 from Devolo.
It is permantly shown as unkwon device. I tried some things which i read in other forums (like wake the thing), but it didnt work.

The device is shown as 2 seperates unkown devices. I dont know why.

Can anyone help me out

best regards, Florian