While doing some more testing, I found out that I could slightly turn on the LED by connecting the end of the resistor to whatever LED lead I wanted (blue or red). The issue is probably between the resistor and the LED then, right? That seems weird because the end of the resistor is well connected to the middle lead.
Also, the fifth lug is indeed connected to the ground but it’s also connected to the red lead of the LED.
Hope that helps,