Neopixel stick doesn't work with Pixhawk 6C Mini

Hello everybody,

I have connected a neopixel stick (WS2812B-8) to my pixhawk 6c mini’s AUX 3 port and set the following parameters:
NTF_LED_LEN=8
NTF_LED_TYPES=65793 (included neopixel on the bitmask)
SERVO11_FUNCTION=Neopixel1

I use holybro qav250 frame kit, it uses power module 06.

I see NeoP in the messages, but leds don’t work.
This is my first quadcopter, so I don’t know how can I investigate this issue?

Thank you!

These are the messages:
9/9/2024 12:48:12 PM : Frame: QUAD/X
9/9/2024 12:48:12 PM : IMU0: fast sampling enabled 2.0kHz
9/9/2024 12:48:12 PM : RCOut: DS300:1-4 PWM:5-8 NeoP:9-12 PWM:13-16
9/9/2024 12:48:12 PM : IOMCU: 410 2003 411FC231
9/9/2024 12:48:12 PM : Pixhawk6C 00290022 3133510F 31343630
9/9/2024 12:48:12 PM : ChibiOS: 6a85082c
9/9/2024 12:48:12 PM : ArduCopter V4.5.5 (142aece2)
9/9/2024 12:48:11 PM : Frame: QUAD/X
9/9/2024 12:48:11 PM : IMU0: fast sampling enabled 2.0kHz
9/9/2024 12:48:11 PM : RCOut: DS300:1-4 PWM:5-8 NeoP:9-12 PWM:13-16
9/9/2024 12:48:11 PM : IOMCU: 410 2003 411FC231
9/9/2024 12:48:11 PM : Pixhawk6C 00290022 3133510F 31343630
9/9/2024 12:48:11 PM : ChibiOS: 6a85082c
9/9/2024 12:48:11 PM : ArduCopter V4.5.5 (142aece2)