Welcome to the forums. Did you make sure to do the following 2 pieces?
From Step 1: "Make note of the root LDAP password that is selected during the installation"
And continued in Step 3: "you need to tell Samba what is the root password for ldap. On your Samba server, restart samba services (/usr/sbin/smbd and /usr/sbin/nmbd) run the following command (replace test123 with your ldap root password). "