Maybe you can draw some further information or ideas from this older thread:
https://community.gigperformer.com/t/widget-bi-directional-nektar-panorama
If i recall it right, the Nektar keyboards don’t offer their full functionality when running in “dumb” midi mode (internal mode). They do work with deep integration only when they are connected to a DAW they “know”… unfortunately Gig Performer is not amongst those (at least it wasn’t when I owned the Nektar).
Btw. it’s quite the same with the NI Komplete Kontrol.