Mellotron V not recognizing my KeyStep Pro

Mellotron V not recognizing my KeyStep Pro. I’ve tried setting the MIDI controller to Generic on the Melloton V MIDI settings and have also tried setting a specific MIDI channel under Mellotron V Global Settings. Please advise.

Are you running the standalone application or the VST in a DAW?
If standalone, do you have the KeyStep enabled in Audio MIDI Settings->MIDI ports?