31 C.F.R. § 598.406
(a) The prohibitions on transactions contained in § 598.202 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 § 598.406: See §§ 598.507 and 598.513 on licensing policy with regard to the provision of certain legal and emergency medical services.
[86 FR 26669, May 17, 2021]