2 C.F.R. § 25.110
(a) General exceptions.
(1) Under a condition identified in paragraph (a)(2) of this section, a Federal agency may exempt an applicant or recipient of Federal financial assistance from the requirement to obtain a UEI, register in SAM.gov, or both.
(2) A Federal agency may exempt an applicant, recipient, or subrecipient when:
(ii)
(A) All of the following conditions are met:
(1) The entity is a foreign organization or foreign public entity;
(2) The Federal award or subaward will be performed outside the United States;
(3) The Federal award or subaward will be less than $25,000; and
(4) The Federal agency deems it to be impractical for the entity to comply with the requirements of this part.