one way conection only?

I have recently bought a new laptop. I installed Teamviewer on it and I can use it to connect to my other computer. It works fine FROM my new laptop
However, when I tried and connect the other way (i.e. TO my new laptop), I get a little popup asking for a password that is on the other computer. What does this mean? (see attached screenshot).
I have never seen anything like this beforeUntitled-1.jpg