Hi,

As this works on one of your servers, whether all your workstation have this issue?

Certificate Enrollment Web Services client computers must be computers running at least Windows 7 or Windows Server 2008 R2 operating systems. To utilize key-based renewal, client computers must be running at least Windows 8 or Windows Server 2012 operating systems.

Please follow the below article for more details:

http://social.technet.microsoft.com/wiki/contents/articles/7734.certificate-enrollment-web-services-in-active-directory-certificate-services.aspx

Regards,

Yan Li