20 C.F.R. § 404.1715

Notice or request to a representative.

        (a) We shall send your representative—

        (1) Notice and a copy of any administrative action, determination, or decision; and

        (2) Requests for information or evidence.

            (b) A notice or request sent to your representative, will have the same

            force and effect as if it had been sent to you.

Official source