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In this manuscript we discuss the device-independent conference key agreement(DICKA) protocol [Phys. Rev. A 97, 022307 (2018)]. We show that the suggestedhonest implementation fails, because perfect correlated measurement results andthe required Bell-inequality violation cannot be achieved simultaneously, incontradiction to what is claimed. We further show via semidefinite programmingthat there cannot exist any suitable honest implementation in the tripartitesetting, rendering the DICKA protocol incomplete.

Comment on "Fully device-independent conference key agreement" [Phys. Rev. A 97, 022307 (2018)]