Modify samba configuration, restart service failed

Service restart samba [email protected]: ~ $$
= = = verify org.freedesktop.systemd1.manage-units = = = =
Authentication is required to restart “samba.service”.
Authentication is: root
Password:
=== Authentication complete ===
Restart samba failed. Service:unit samba. the service is masked.

dll @lx100:~$ sudo systemctl restart smbd service

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