The installer-feature-network-shares-stage3 package replaces the /etc/samba/smb.conf file
The generated file contains the setting:

passdb backend = ldapsam:ldap://127.0.0.1/

But the slapd service on the node is disabled.
As a result, an error occurs:

fetch_ldap_pw: neither ldap secret retrieved!
pdb_init_ldapsam_common: Failed to retrieve LDAP password from secrets.tdb
pdb backend ldapsam:ldap://127.0.0.1/ did not correctly init (error was NT_STATUS_NO_MEMORY)