I use that stylus and that device too... Can you give me a bit more detail about what's happening? Can you tell me what you've tried?
I checked that the app would connect with the Adonit script pen (it did).
I then followed advice Adonit sent for Sketchbook pus:
restart the app and the iPad.
turn off bluetooth for awhile and restart it.
Turn off multitasking items in the general Settings menu.
Turn off zoom in accessibility ...
go to app tool preferences. Select pen.
Pen should have charged (green light),
It should be able to slide icons and open them after starting.
in Sketch, at the point of connecting -- start the pen (series of brighter green flashes) and touch the connect pad.
It should connect, but mine doesn't.
Maybe a dumb question: Have you tried it with any other app (besides Sketch or Draw)? Is it working OK in those?