ssh - Public key authentication on Windows OpenSSH server

I have two Windows machines running on Ubuntu virtual box. Both machines have OpenSSH installed. I can connect from one to another using ssh and passwords, but I can not figure out how to use keys.

I generated keys on the client machine using ssh-keygen -t rsa, saved the public key on the remote machine as authorized_keys in the folder C:\Users\username\.ssh and changed the settings to PasswordAuthentication no in Program Files\OpenSSH\etc\sshd_config and restarted SSH server. When I try to connect I get an error

Permission denied (public key,keyboard-interactive)