PWM on Portena X8

I have a Portena X8 and MaxCarrier.
I am trying to use pwm, pin number on 33,35,37 or 38 on J5. On MAxCarrier
It does not work.

Tries to use this simple sketch.
<
int pin = 33
void setup(){
pinMode(pin,OUTPUT);
}

void loop(){

analogWrite(pin,0);
delay(1000);
analogWrite(pin,255);
delay(1000);
}
/>

I am facing a similar issue, which I have detailed in a post on this GitHub issue: Assistance Required with Portenta X8 Analog Pin Reading and Sampling Rate Query · Issue #1525 · arduino/docs-content · GitHub