can't record from USB turntable

Hello Collective Wisdom,
Have turntable hooked to iMac via “Digitnow USB Audio Capture” device,
in Audacity have Recording Device set to USB Microphone,
yet when I try to record from an LP Audacity registers no input (flatline in both channels) (and I hear nothing).
Clearly some setting somewhere I’m missing-- but what, where?
TIA for help!!

Mac OS 10.14.6, Audacity 2.1.0

What model of Macintosh are you using?

First, you should upgrade to the latest Audacity here.

Second, have you given Audacity permission to use the “microphone”? See this post.

Third, that device does not appear to have a built-in phone pre-amp. What turntable are you using? Do you know if it has a built-in phono pre-amp?

– Bill