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We study congruences between a Hermitian Klingen--Eisenstein lift associated with $f$ and Hermitian cusp forms on the quasi-split unitary group $\\mathrm{U}_{2,2}$. Under explicit arithmetic hypotheses on a congruence prime, we prove that the Hermitian cusp eigenform appearing in such a congruence is the Hermitian spin lift of a Siegel cusp eigenform of weight ${\\det}^{k}\\mathrm{Sym}^{j}$. 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