LDAP client config GSSAPI

Configure ldap client:
I have configured my ldapclient with the AuthenticationMethod=simple and with the credentialLevel=proxy. However, as soon as i want to set the AuthenticationMethod=sasl/GSSAPI, and credentiallevel=self, then it fails to configure. Kerberos is already setup successfully. The ldapclient is also online with the svcs -a output

I would appreciate any suggestions to overcome this problem.
thanks.