On Nov. 1, 2018, USCIS began requesting that domestic applicants filing Form N-565, Application for Replacement Naturalization/Citizenship Document, go to an Application Support Center (ASC) appointment to submit biometric information (including photos, signature, and index fingerprint). USCIS will also ask applicants filing Form N-600, Application for Certificate of Citizenship, to begin submitting biometric information at ASCs early next year.
Applicants will not have to pay a biometrics fee at this time.
USCIS is implementing this process as the agency works to transition operations to a fully electronic environment.
Source: AILA Doc. No. 18111532.