Logic I/O assignments showing nothing under ‘inputs’ tab

My NI Traktor S4 MK 2 audio interface is set up as my audio device in Logic. Under I/O output tab I have outputs 1 and 2 selected. But under the I/O input tab there is nothing but a blank pane with no choices to make. Native Instruments ran I script on my machine to check my settings and they concluded everything is up to date and should be working. They said they couldn’t replicate the fault at their end, and I should contact Apple.

I can use Logic with the S4 MK2 for everything except for Audio input. (Playback of projects works as expected)

In Mac ’audio Settings’ the input works, I can see the meter rise and fall with the signal from a microphone. Has anyone else seen a fault where their audio interface isnt shown as an input in I/O assignments?

cheers, Stu