Pam_duo not working with CentrifyDC

I am trying configure pam_duo and login_duo (duo_unix-1.11.4) in different RHEL platforms, where we already using CentrifyDC (CentrifyDC 5.1.1-831) to integrate with AD.
login_duo is working as expected but in pam_duo we are facing issues (not working at all) as /etc/pam.d/system-auth and /etc/pam.d/password-auth is already modified by Centrify.
Did any one faced such an issue ?

Any help is much appreciated.