LP-MSPM0G3507: Brownout interrupt not going into NMI_Handler

I am trying to get the NMI_Handler to reset the device.  I have set the brownout level to 3.  during debug and also with debugger detached i do not see the reset

the main is setup to turn the led on for a couple seconds then turn off.  at that point I lower the voltage to 2.1V.  i do not see the reset with the leds turning back on for a couple seconds again

I have pasted the main code here.  Would really appreciate any help. Thanks

SYSCONFIG_WEAK void SYSCFG_DL_init(void)
{
    SYSCFG_DL_initPower();
    SYSCFG_DL_GPIO_init();
    /* Module-Specific Initializations*/
    SYSCFG_DL_SYSCTL_init();
    SYSCFG_DL_SPI_0_init();
    SYSCFG_DL_SYSTICK_init();
    SYSCFG_DL_WWDT0_init();
    /* Ensure backup structures have no valid state */
	gSPI_0Backup.backupRdy 	= false;

}



SYSCONFIG_WEAK void SYSCFG_DL_SYSCTL_init(void)
{
    DL_SYSCTL_setSYSOSCFreq(DL_SYSCTL_SYSOSC_FREQ_BASE);

	//Low Power Mode is configured to be SLEEP0
    DL_SYSCTL_setBORThreshold(DL_SYSCTL_BOR_THRESHOLD_LEVEL_3);

}

void  INTERRUPT_Initialize (void)
{
    // Interrupt prepare
    NVIC_ClearPendingIRQ(SPI_0_INST_INT_IRQN);
    NVIC_EnableIRQ(SPI_0_INST_INT_IRQN);
}



int main(void)
{

    SYSCFG_DL_init();
    INTERRUPT_Initialize();  
   
    DL_SYSCTL_activateBORThreshold();

   int ii = 0;
   while(ii++ < 1000000)
   {
     DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_2_PIN);
   }
   DL_GPIO_clearPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_2_PIN);

   while(1);
}



void NMI_Handler(void)
{

       DL_SYSCTL_NMI_IIDX value = DL_SYSCTL_getPendingNonMaskableInterrupt();
       switch (value)
       {
           case DL_SYSCTL_NMI_IIDX_BORLVL:
               DL_SYSCTL_resetDevice(DL_SYSCTL_RESET_POR);

               break;
           default:
               break;
       }
}