RGB LED not responding to Serial Monitor Input - Programming Questions - Arduino Forum

Good afternoon, I recently started learning Arduino coding and some basic circuit building from Paul McWhorter on (great teacher btw). I was following his tutorial of building a circuit with an RGB LED that responds to the Serial Monitor Input. However, I haven't been able to get my code to work and I cannot figure out why. My code looks very similar to Paul's in his video and as far as I can tell, my circuit looks like it is built correctly. What am I missing here? (link

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