To affect Federal Benefit Payments—

(a) Service must be made upon the Department at the address provided in appendix A to this subpart for—

(1) Legal process under section 659 of title 42, United States Code, and part 581 of Title 5, Code of Federal Regulations, or

(2) Any request for or notice of appointment of a custodian, guardian, or other fiduciary to receive Federal Benefit Payments as representative payees under § 29.106;

(b) All other process regarding Federal Benefit Payments (including requests for judicial review under § 29.406) must be served upon the United States in accordance with applicable law.

(c) All other process regarding Federal Benefit Payments must be served upon the United States in accordance with applicable law.