sound but no waveform after new microphone and interface

The sound wave is still quite itty bitty, though better than it was.

I don’t know that jumping the gun is a good idea. Could you get the red Solo knob? Ever? Even yelling? Could you hear yourself on your wired headphones connected to the solo?

All the other Solo lights in order?

While shooting the screen with your phone does work, Windows has a tool to capture whole screens and portions thereof.

Do you use Zoom? The communications tool, not the sound recorder? Skype? Any other communications, chat, or conference tool? Make sure they’re closed and not just napping or waiting for a call. It’s not the worst idea to clean shutdown your Windows machine before a recording. Shift+Shutdown, not just Shutdown or Restart.

You should go into Windows control panels and make sure all the Windows “Enhancements” are turned off.

https://manual.audacityteam.org/man/faq_recording_troubleshooting.html#enhancements

When you get all this together, start a recording. Announce louder and louder until the Solo knob turns red. What happens to the Audacity blue waves when you do that?

Koz