Setting specific GPIO_Output pins high/low

I am able to set pins (high/low) that I have specified to be GPIO_Output in the Pinout& Configuration tab of the .ioc file.

Using the code written below (changing the pin number) I am able to observe the expected behaviour on a oscilloscope using all of the PA pins except (PA2,PA3 and PA8).

Why am I not able to observe the behaviour on these pins? I am using the STM 32L072 Nucleo-64.

Thanks in advance

while (1)
 {
 /* USER CODE END WHILE */
 
 /* USER CODE BEGIN 3 */
	 HAL_GPIO_WritePin(GPIOA,GPIO_PIN_15,GPIO_PIN_SET);
	 HAL_Delay(100);
//	 HAL_ADC_Start(&hadc);
//	 HAL_ADC_PollForConversion(&hadc,HAL_MAX_DELAY);
//	 raw = HAL_ADC_GetValue(&hadc);
 
	 HAL_GPIO_WritePin(GPIOA,GPIO_PIN_15,GPIO_PIN_RESET);
	 HAL_Delay(500);
 }