"this buddy is already in the buddy list of the group owner" found nowhere

Hi all,

We installed Teamviewer Host on a RAspberry Pi 3 (under Raspbian OS), who didn't appear on our console. When trying to put it manually, it says "this buddy is already in the buddy list of the group owner".

The problem is I can't find it nowhere in the hole list !!

Any idea ? I'm using latest version of Temviewer.