Halftone not affected by Lights

I set up a procedural halftone network and all of a sudden the light no longer affects my Material. It was working before but now there is no change no matter where I move the light. Can anyone help? Thanks in advance!

halftone_monkey_light_unresponsive.blend (953.8 KB)

Problem solved myself! Just realized I forgot to check “Scene Lights” in the Viewport Shading menu in the top right corner. DUH! Hopefully this can help some people out there who are as careless as myself!