Audacity won't record anymore

Using Audacity 3.04 on MacBook Air running macOS 11.6.8.
I haven’t used Audacity in a few years. I had recorded from cassette tapes to mp3, using an ION Tape Express PnP device.
Now I can see sound input on Sound, but no output. Any suggestions?

That’s one of those cheap cassette-to-USB devices, right? It shows up as “PnP Audio Device” or similar? No-one we know has managed to get one of those things to work reliably on Mac.
– Bill