Chris,
I am not so familiar with AD configuration, but upon searching I saw this link
https://technet.microsoft.com/en-us/library/dd251831.aspx which specify the path and dll name for ad provider Program Files\Microsoft Provisioning\Providers\MPFADProv.dll . Are you referring to this one?
Thanks so much for the help. I will give feedback once it works f or others also to know.
Regards,
Elena