kazulog@sv1:~$ echo 'PasswordAuthentication no' | sudo tee /etc/ssh/sshd_config.d/99-hardening.conf
PasswordAuthentication no
kazulog@sv1:~$ sudo sshd -t
kazulog@sv1:~$ echo $?
0
kazulog@sv1:~$ sudo sshd -T | grep -i passwordauthentication
passwordauthentication yes
kazulog@sv1:~$ sudo systemctl reload ssh
kazulog@sv1:~$ sudo sshd -T | grep -i passwordauthentication
passwordauthentication yes