The office that performs that authentication is the Authentications Division of the U.S. Dept of State. We handle that step for you. So there is no need to do anything to your CFG except to send it to us and we will have it legalized either by apostille or by consular legalizations depending on your destination country. So don’t create extra work for yourself unless you really want to... https://wcss.com/ask-wcs-myth-busting-on-requirements-for-cfgs-certificate-to-foreign-government/