HAL_RTC_SetAlarm_IT не работает будильник после установки времени

MX_RTC_Init();
HAL_RTCEx_EnableBypassShadow(&hrtc);
GPIO_SET(GPIOA,8); // прописано в дефайне все пашет
// переустанавливаем время
sTime.Hours = 01;
    sTime.Minutes = 00;
    sTime.Seconds = 00;
    sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
 
HAL_RTCEx_DisableBypassShadow(&hrtc);
    if (HAL_RTC_SetTime(&hrtc,&sTime,RTC_FORMAT_BIN) != HAL_OK){ // эта функция возвращает ОК! если ее закоментить то все работает
        ssd1306_Fill(Black);
        ssd1306_SetCursor(0,10);
        ssd1306_WriteString("Ошибка часов",Font_11x18,White);
        ssd1306_UpdateScreen();
    }   
HAL_RTCEx_EnableBypassShadow(&hrtc);
 
// установка будильника
sAlarm.AlarmTime.Hours = 0;
  sAlarm.AlarmTime.Minutes = 0;
  sAlarm.AlarmTime.Seconds = 40;
  sAlarm.AlarmTime.SubSeconds = 0;
  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
  sAlarm.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY;
    //sAlarm.AlarmMask = RTC_ALARMMASK_SECONDS;
  sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
  sAlarm.AlarmDateWeekDay = 1;
  sAlarm.Alarm = RTC_ALARM_A;
if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, RTC_FORMAT_BIN) != HAL_OK) // возвращает ОК
  {
    ssd1306_Fill(Black);
        ssd1306_SetCursor(0,10);
        ssd1306_WriteString("Ошибка уст",Font_11x18,White);
        ssd1306_UpdateScreen();
  }

// инициализация RTC
static void MX_RTC_Init(void)
{
 
  RTC_TimeTypeDef sTime;
  RTC_DateTypeDef sDate;
  RTC_AlarmTypeDef sAlarm;
 
    /**Initialize RTC Only 
    */
  hrtc.Instance = RTC;
  hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
  hrtc.Init.AsynchPrediv = 99;
  hrtc.Init.SynchPrediv = 399;
  hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
  hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Initialize RTC and set the Time and Date 
    */
  sTime.Hours = 0;
  sTime.Minutes = 0;
  sTime.Seconds = 0;
  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
  sDate.WeekDay = RTC_WEEKDAY_MONDAY;
  sDate.Month = RTC_MONTH_JANUARY;
  sDate.Date = 1;
  sDate.Year = 0;
 
  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Enable the Alarm A 
    */
  sAlarm.AlarmTime.Hours = 0;
  sAlarm.AlarmTime.Minutes = 0;
  sAlarm.AlarmTime.Seconds = 0;
  sAlarm.AlarmTime.SubSeconds = 0;
  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
  sAlarm.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY;
    //sAlarm.AlarmMask = RTC_ALARMMASK_SECONDS;
  sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
  sAlarm.AlarmDateWeekDay = 1;
  sAlarm.Alarm = RTC_ALARM_A;
  if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, RTC_FORMAT_BIN) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
}