Hi Amita,
After extensive testing of all the combination of settings available, I have found a ?combination that works for what I am trying to achieve.
Spectrum.ldap.dn.format set at %s@domain
Spectrum.ldap.dn.base set at DC=adc,DC=govt,DC=nz :(top of the domain tree)
Spectrum.ldap.search.filter set at sAMAccountName={user}
I have let PB support know to update engineering with this and to maybe include this as a note in the Ldap settings document, that if your having issues try that combination.
Hopefully this helps others
cheers