Unable to control WS2812C with custom PCB using FastLED

Good afternoon,

I am not sure if my error is somehow in the Blink example or if I accidently missed something in my attached snippet of my circuit design. My understanding was all I needed was a 300 Ohm resistor from the datapin of the Atmega328PB in series to the DataIn of my first LED (LED0). I have successfully burned the bootloader to use the internal clock (8 MHz) before anyone points out the lack of a crystal for the external clock.

With the code below (from the FastLED Blink example, I just removed the comments to not have it take up so much space here) I am able to turn on as many of the LEDs as I want (currently I have it back down to 1, but if I set it to 4 all 4 will turn on when I program this using a programmer via ISCP (and the Arduino IDE) however that is all that I can get to happen. It will not change colour, it will not turn off the LED until/unless I upload a new version of the code using less LEDs.

#include <FastLED.h>

#define NUM_LEDS 1

#define DATA_PIN 10

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() { 

     FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);  // GRB ordering is typical
  
}

void loop() { 
  // Turn the LED on, then pause
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  // Now turn the LED off, then pause
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}

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