Beginning March 29, 2024, 2-step authentication will be mandatory to login to the FCC’S Commission Registration System (CORES) and its associated FCC User Registration System. Paying ULS application fees, requesting an FCC Registration Number (FRN) or updating an FRN Password require accessing FCC CORES with a Username Account. Please ensure your FCC Username Account is up to date and that you have access to the corresponding e-mail inbox. For more information please refer to the Public Notice.