I downloaded the Jacob Collier Audience Choir from Native Instruments, and I have Kontakt 8 installed, version 8.8.0. All the features work fine as a standalone.
I want to use it with Garage Band. I am running MacOS Sequoia 15.7.3. I gave full disk access to Native, NTKDaemon and Kontakt 8. I created a midi file, selected Kontakt 8 stereo as a plug in. I can record on that track using either the Kontakt player keyboard or an external keyboard and the midi. I can see the notes showing in the Garage Band track. So Midi information is sent from Kontakt to Garage Band. But when I hit play in Garage Band I don't get any sound. However if I choose a different plug-in I do have a sound.I suspect it is an issue with the plug in parameters as they are all empty (see screenshot). For all the other plug ins there are some information in this parameters window, but not for Kontakt.