RME Fireface 400/ MIDI keyboard not working

I have a problem in that my Cubase projects will not accept my midi keyboard inputs. I have an AKAI MK261 that has a Cubase project setup but even though I can see the midi input at the transport level the software instruments are not accepting the MIDI signal. I have looked at all the usual suspects, Cubase studio/midi setup. RME Fireface setup etc . Any ideas?
Mac MINI OS X Cubase 11 RME Fireface 400

Hi,

Do you connect MK261 via USB or via MIDI to the RME, please?

Make sure, the MIDI Input is not in use for any Remote Device, please.

I have the AKAIn MK261 connected via USB

Oddly it works fine in Logic!