A while ago I learned for a Dorico user that
Dorico sends the pitch info through Expression Map Data/Microtonality playback: Pitch Bend and Pitch Bend range should be set to: 2.
In order for the Kontakt instrument to receive this info the settings below need to be made. Without doing this the instrument plays detuned frequencies, just not the correct ones.
In Kontakt: press wrench button/Edit All Groups/Add Modulator/External Sources/Pitch Bend. The slider needs to be set at 1 semitone.