Não é possível reiniciar o SSH após adicionar a entrada do host em sshd_config

O que estou fazendo de errado?

Eu adicionei dentro de /etc/ssh/sshd_config:

Host myserver
     HostName xxx.xxx.xxx.xxx
     User myuser
     Port 22

• Quando tento reiniciar sshd, recebo o erro:

  $ sudo systemctl restart sshd 
  
    Job for ssh.service failed because the control process exited with error code.
    See "systemctl status ssh.service" and "journalctl -xe" for details.
  

  
  
• Há um erro de sintaxe em sshd_config?

  $ systemctl status ssh.service
  
    ssh.service - OpenBSD Secure Shell server
      Loaded:   loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
      Active:   failed (Result: exit-code) since Mon 2023-07-31 14:08:15 EDT; 3min 31s ago
        Docs:   man:sshd(8)
                man:sshd_config(5)
      Process:  1780 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=255/EXCEPTION)
          CPU:  3ms
  

  $ journalctl -xe
  
    My-VM sudo[1772]: myuser : TTY=pts/0 ; PWD=/var/www/example.com ; USER=root ; COMMAND=/usr/b>
    My-VM sudo[1772]: pam_unix(sudo:session): session opened for user root(uid=0) by myuser(uid=1000)
    My-VM sudo[1772]: pam_unix(sudo:session): session closed for user root