2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98062In this paper we prove the existence of a formal dynamical twist quantization for any triangular and non-modified formal classical dynamical $r$-matrix in the reductive case. The dynamical twist is constructed as the image of the dynamical $r$-matrix by a $L_\infty$-quasi-isomorphism. This quasi-isomorphism also allows us to classify formal dynamical twist quantizations up to gauge equivalence.13 pages, 1 section added (classification of dynamical twists), LaTeX, final version, to appear in Adv. MathQuantum Algebratext