Turns out the driver installation was never completed.
I found this on the support page (can’t post a link):
macOS: Audio interface not working properly / cannot be selected in DAW / missing in Audio MIDI Setup
Here’s what I did:
- Install Yamaha Steinberg USB Driver V3.0.5
- Direct to system menu/ preference/ security and privacy/general tab
- Allow Yamaha Corporation
- Install Yamaha Steinberg USB Driver V3.0.5 again
I hope this helps.