Starting Sunday, January 17, 2021 at 6:00 a.m. through 6:00 a.m. ET, Tuesday, January 19, 2021. the Social Security Administration will be conducting system maintenance on its Consent Based Social Security Number Verification (CBSV) service. Please note services will be unavailable during the maintenance window, but we will process your requests as soon as we can. Thank you in advance for your patience.