AuthenticationContextClass in SAML

Hello Team,

SAML Application is expecting AuthnContext in the assertion  to be urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport,

but I do see that Centrify passes the value as urn:oasis:names:tc:SAML:2.0:ac:classes:unspecified.

Is there any way that I can force Centrify  to send  application desired  AuthnContext value ??

I tried the adding these lines to the SAML script  , but it still pasess the Authcontext as unspecified.

setAuthnContextClass('PasswordProtectedTranspor');

setAttribute('SAML_AUTHN_CTX', 'urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport');

Please suggest ..!!!