Password Synchronization, is it really working?

[Antoni Antich Cifre]

In CAS 6.3.7.4, trying to get password synchronitzation working to synchronize an LDAP directory after successful CAS authentication. I have followed the instructions stated in url 

https://apereo.github.io/cas/6.3.x/installation/Password-Synchronization.html#password-synchronization

and links related 

https://apereo.github.io/cas/6.3.x/configuration/Configuration-Properties.html#password-synchronization , https://apereo.github.io/cas/6.3.x/configuration/Configuration-Properties-Common.html#ldap-connection-settings

I think I have configured all the mentioned properties about Password Synchronization:

cas.authn.password-sync.enabled=true 

cas.authn.password-sync.ldap[0].enabled=true

cas.authn.password-sync.ldap[0].ldap-url=ldaps://ldap1.example.edu ldaps://ldap2.example.edu 

cas.authn.password-sync.ldap[0].bind-dn=cn=-directory -manager,dc=example,dc=org # cas.authn.password-sync.ldap[0].bind-credential=Password
etc.

But I haven't succeded, even I can not get any simple message related to *sync* in log, level DEBUG.

Someone can explain something not described in CAS help to achive password synchronitzation from CAS to LDAP?

Some full explained configuration properties and modules needed?

Maybe it works in another version? 6.4.x? 

Thanks in advance.