Error connecting to mac from visual studio

I fixed this problem by manually importing the public ssh key in MonoTouch folder into the authorized_keys on mac.
To do so :
1- Copy the content of 'id_rsa.pub' located in "%localAppData%/Xamarin/Monotouch"
2- In your MAC (assuming that it is running on a VM), go to "/Users//.ssh/Authorized_keys" Open the file, paste the key in a new line, save then close.
3- Now go back to your Visual Studio and try again, you'll be able to pair your macOS
Enjoy