31 C.F.R. § 536.406
(a) The prohibitions on transactions contained in § 536.201 apply to services performed in the United States or by U.S. persons, wherever located, including by a foreign branch of an entity located in the United States:
Note 1 to § 536.406: See §§ 536.506 and 536.511 on licensing policy with regard to the provision of certain legal and emergency medical services.
[86 FR 26665, May 17, 2021]