Sorry so long for the reply guys. Been a wee bit under the weather.
So, my Focusrite Clarett USB is my main interface.
My Scarlett 2nd Gen is my second interface. The Scarlett ADAT’s into the Clarett
(Scarlett is ADAT clock Clarett is internal).
Cubase recognizes all the ADAT inputs in the connections page.
I can see the signal making it into the Scarlett.
After assigning the ADAT inputs to a track to record my Roland synth in stereo there is no signal reaching the input monitoring stage of Cubase.
I’ve gone through the Focusrite and Steinberg pages and my PC is completely optimized for audio.
I’d keep pulling out my hair but here’s not much left. 
Windows 10Pro, 64MB RAM, 1TB HD. Tons’ of CPU power!