Add LAN IP adress to Partners List - Missing Option

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Hi everyone,
It seems like it's impossible to add a local network IP such as 10.0.0.1 to my partners list.
It does work if I am trying to connect from the main screen (writing the IP manually) even from my iPhone & the Web-Interface. But it just won't let me add it to my Partners list.

Tried to add it from the Web-Interface, and from the iPhone. The first one gives an error, the second one just add the ID as "10".

Any suggestions?
Thank you.