Syncing JDXA with cubase

Hey folks,

Must be missing something really obvious here, but attemoting to set up my JDXA to tempo sync with cubase is something I’m struggling with. I’ve gone into the settings on the synth menu, and I have set it as a slave device, to sync with cubase’s tempo. I have checked that MIDI Clock is to be sent to the JDXA, but still nothing. The synth itself if not making a noise, solely when set to SLAVE. The tempo display on the synth also goes to “—” as if its looking for tempo information but not receiving anything. I’ve set up via USB, so this should be pretty straight forward

Any ideas as to the solution?

Thanks in advance