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We first describe the organization of this addendum. Section 1 corrects the statement of [10, Theorem 1]. Section 2 corrects [10, Proposition 19], which applies to [10, Theorem 3 and Corollary 4]. This correction requires an extra hypothesis that, conjecturally, is unnecessary. Finally, Sec. 3 gives a corrected proof of [10, Proposition 20]. The corrected proof also implies Theorem 5 below, which generalizes [10, Theorem 3] to SU(n, 1) for n ≥ 4 (independent from the corrections to [10, Theorem 3]).

ERRATUM AND ADDENDUM: "PROPERTY (FA) AND LATTICES IN SU(2,1)"