Failed to start OpenSSH server daemon, Subsystem 'sftp' already defined.

Issue

• ssh: connect to host xxxxx port 22: Connection refused Connection closed

• Failed to start/restart sshd service.

  sshd[xxxx]: /etc/ssh/sshd_config line xx: Subsystem 'sftp' already defined.
  systemd[x]: sshd.service: Main process exited, code=exited, status=255/n/a
  systemd[x]: sshd.service: Failed with result 'exit-code'.
  systemd[x]: Failed to start OpenSSH server daemon.