In [J. A. Rebou\c{c}as and P. A. Brand\~{a}o, Phys. Rev. A 104, 063514
(2021)] the authors compute the scattering amplitude for a
PT-symmetric double-delta-function potential in three
dimensions by invoking the far-zone approximation and summing the resulting
Born series. We show that the analysis of this paper suffers from a basic
error. Therefore its results are inconclusive. We give an exact closed-form
expression for the scattering amplitude of this potential.Comment: 2 page