Shutdown Mode Enter and Exit in stm32u083rc using WAKEUP PIN

[Sumukha]

I am not able to enter into the shutdown mode, i am using the below code 

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_RTC_Init();
  MX_USART2_UART_Init();
 __HAL_RCC_PWR_CLK_ENABLE();
    HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1_HIGH);
    HAL_PWREx_EnablePullUpPullDownConfig();
    HAL_PWREx_EnableGPIOPullDown(PWR_GPIO_A, PWR_GPIO_BIT_0); 
    HAL_SuspendTick();
    HAL_PWR_EnterSHUTDOWNMode();  

  while (1)
  { 
  }
}   

with this what is happening is it behaving like an infinite loop it is going  into shutdown mode and instantly waking up and again going back to shutdown, after checking the power it is 350uA, which is not the power which we will get in shutdown mode, so I wanted to know what is wrong and also how to properly enter and exit from shutdown mode. also what should be the configuration of the wakeup pin in the cubemx.