Problem with config my hotend with EBB 42

I have a problem with my hotend cooling, i have a EBB 42 v1.2 my hotend fan 24v. i connected to PA01, when i heat up the hotend the fan will not start. but if I use the slider bar it will start # Hotend cooling fan
[heater_fan toolhead_cooling_fan]
heater: extruder

2-pin fan connected to 2-pin header on Octopus Pro 446 - input voltage pwm

pin: toolboard_t0:PA1
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