CCS/MSP430FR5969: RTC_C Alarm not interrupting

/*
 * mainTest.c
 *
 *  Created on: Jul 31, 2018
 *      Author: Sanskriti Joshi
 */

#include <msp430fr5994.h>

int PollingInterval = 2;
volatile int counter = 0;


int main(void){
    MCU_Init();
    MCU_Init_Clock();
    RTCsetup();

    while(1){
        __bis_SR_register(GIE|LPM3_bits);
    }
}

void MCU_Init()
{
    // configure MCU Pins
    WDTCTL = WDTPW | WDTHOLD;   // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;       //disable the GPIO power-on default high-impedance
}

void MCU_Init_Clock()
{
      PJSEL0 = BIT4 | BIT5;               //initialize the LFXT pins

      CSCTL0_H = CSKEY >> 8;                                // Unlock CS registers
      CSCTL0 = CSKEY;
      CSCTL1 = DCOFSEL_0;                                   // Set DCO = 1MHz (measured with Oscilloscope to be slightly less that 1 MHz)
      CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK;  // set ACLK=VLO;SMCLK=DCO Note: the VLO is typically 10 kHz (measured with Oscilloscope to be slightly less that 10 MHz)
      CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1;                 // set all dividers
      //start of code added for RTC
      CSCTL4 &= ~LFXTOFF;                                       //enable the crystal
      do{
          CSCTL5 &= ~LFXTOFFG;                                  //clear LFXT  fault flag
          SFRIFG1 &= ~OFIFG;
      }while (SFRIFG1 & OFIFG);                                 //test oscillator fault flag
      //end of code added for real time clock
      CSCTL0_H = 0;                                         // Lock CS Registers
}

void RTCsetup(void){
    //RTC_C setup

    RTCCTL0_H = RTCKEY_H; // unlock RTC registers
    RTCCTL0_L = RTCTEVIE_L | RTCRDYIE_L; //Enable RTC Ready Interrupt and Time Event Interrupt
    RTCCTL13 = RTCBCD | RTCMODE | RTCHOLD; // Enable BCD mode, enable RTC in calendar mode, hold while date/time values are set

    //SET date time info
    RTCYEAR = 0x2018;
    RTCMON = 0x7;
    RTCDAY = 0x25;
    RTCDOW = 0x4;
    RTCHOUR = 0x12;
    RTCMIN = 0x50;
    RTCSEC = 0x00;

    //RTC clock alarm setup
    RTCalarmSet(PollingInterval);
    RTCAMIN |= RTCAE; //enable minute alarm
    RTCCTL13 &= ~(RTCHOLD); //start RTC
    RTCCTL0_H = 0;

}

void RTCalarmSet(int PollingInterval){
    RTCAMIN = 0x00;
    RTCAHOUR = 0x00;
    RTCADOW = 0x00;
    RTCADAY =0x00;

    unsigned int Temp_time = 0;
    Temp_time = (((RTCMIN >> 4) & 0x0F) * 10) + (RTCMIN & 0x0F);
    Temp_time += PollingInterval;
    if(Temp_time > 59){
        Temp_time -= 60;
        RTCAMIN = (Temp_time / 10) << 4;
        RTCAMIN |= (Temp_time % 10);
    }else{
        RTCAMIN = (Temp_time / 10) << 4;
        RTCAMIN |= (Temp_time % 10);
    }
}

#pragma vector = RTC_C_VECTOR
__interrupt void RTC_C_ISR(void){
    switch(__even_in_range(RTCIV, RTCIV__RT1PSIFG)){
    case RTCIV_RTCTEVIFG:   //minuteInterrupt
        counter = counter - 1;
        break;
    case RTCIV_RTCRDYIFG:   //secondInterrupt
        break;
    case RTCIV_RTCAIFG:     //alarm interrupt
        //RTCalarmSet(PollingInterval);
        RTCAMIN |= RTCAE; //enable minute alarm
        counter = counter + 1;
        break;
    default:
        break;
    }
    __bic_SR_register_on_exit(LPM3_bits);
}