I have seen the same question many times but not with a successful outcome so far. I am a free user and would pay for a licence if I can prove to myself that I can get unattended access working. I am connecting from Windows 10 to Abuntu (latest version). Have selected 'Easy access'. Have also disabled 'random password' in Advanced. Have spend a full day trying to get this to work but, whatever I do, my connections still require authorisation on the client. This renders TeamViewer unusable in my case as I am dealing with headless clients. Any suggestions?