Unable to get audio from Mac computer OR Steinberg C1

Hadn’t used Cubase 12 for a couple of months and on returning I can’t get audio. (got it fine before)
I have Steinberg C1 connected to Apple Mac. Audio Connection for output says stereo MJ Recorder Device 1

Hi and welcome to the forum,

Make sure Cubase has enabled Mic in the System Preferences, please.
Open macOS System Preferences > Security & Privacy > Privacy > Microphone. Enable Cubase here.

If this doesn’t hep, attach a screenshot of the Audio Connections > Outputs, please.