Can't get Audio Inputs to work, but instrument inputs work OK

I’m using Cubase Pro 13 and it seems that I can’t get the Audio recording tracks to work at all. I’m using Windows 10 on a desktop. I see that the Stereo Input track shows audio coming in, but the track I’ve assigned to the audio shows no activity at all. Why would that happen. I found no YouTube videos on this and nothing in the manual on this.

Can you give a screenshot of it?

Just a guess, but did you click the monitor button?