Correction to: Categorical Relations Between Langlands Dual Quantum Affine Algebras: Exceptional Cases (Communications in Mathematical Physics, (2019), 368, 1, (295-367), 10.1007/s00220-019-03287-w)

In this addendum, we remove the ambiguity for roots of higher order of denominator formulas in our paper. These refinements state that there are roots of order 4, 5, 6, which is the first such observation of a root of order strictly larger than 3 to the best knowledge of the authors. (Formula presented.).