Errata to the paper
T.H. Koornwinder and M. Mazzocco,
Dualities in the $q$-Askey scheme and degenerate DAHA,
Studies Appl. Math. 141 (2018), 424-473;
arXiv:1803.02775v3 [math.CA].

On p.450 in the journal version or on p.25 in the arXiv version replace in the
last line before subsection 5.5
$qa,b,c,d$ by $q\tilde a,\tilde b,\tilde c,\tilde d$.