@xfacta @Ronald The reason that NeoPixel LEDs don’t function on Cube is because they require > 0.7*Vcc signal line, Aux pins put out 3.3V and generally power tends to be solid 5V.
The best solution is to use ProfiLEDs available here: CubePilot - ProfiLED-2m reel - Autopilots from 3DXR UK https://nwblue.com . Documentation for the LEDs is here https://docs.cubepilot.org/user-guides/profiled/profiled . We have had LED strips designed specifically for Our Cubes for quite sometime, and its encouraged that they be used to get the best result.
Regarding NeoPixels, to make them work you need to place a Pullup (around 5K Ohm to 5V) on the signal pin to drive the signals to meet the specification for them. Once you do that I believe they should start functioning. If you are still having issues please let us know.
I know that there is a fix here NeoPixel — Copter documentation but for Cubes the fix that I recommend is the one to take, and is a clean solution that works for cubes as we have Protection Circuit, which allows us to safely place a pull-up on the signal end.