20 C.F.R. § 404.1710

Authority of a representative.

            (a)
            What a representative may do.
             Your representative may, on your behalf—

        (1) Obtain information about your claim to the same extent that you are able to do;

        (2) Submit evidence;

        (3) Make statements about facts and law; and

        (4) Make any request or give any notice about the proceedings before us.

            (b)
            What a representative may not do.
             A representative may not sign an application on behalf of a claimant for rights or benefits under title II of the Act unless authorized to do so under § 404.612.

Official source