MSP430FR2522: Incorrect values from internal temperature sensor

I am trying to read ambient temperature with an MSP430FR2522 using the internal temperature sensor.

I am using the calibration data (link) stored in the device to convert the ADC counts to temperature.

I see the output reacting to temperature changes, however the problem is that I seem to be getting values offset of about +57 °C with respect to the actual temperature.

Here is the gist of my code:

/* Minimalistic example code (not actual implementation) */

// Calibration values
#define ADC_TC_15V_30C  (*((uint16_t *) 0x1A1A)) // Temp sensor cal at 30 °C
#define ADC_TC_15V_85C  (*((uint16_t *) 0x1A1C)) // Temp sensor cal at 85 °C

// ADC initialization
PMMCTL0 = PMMPW; // Unlock PMM control register
PMMCTL2 |= TSENSOREN | INTREFEN; // Enable temperature sensor and internal VREF

ADCCTL0 &= ~ADCENC; // Disable ADC conversion before writing configuration

ADCCTL0 |= ADCSHT_8; // S&H time = 256 ADCCLK cycles
ADCCTL1 |= ADCSHP; // S&H source: ADCSC bit, S&H signal generated from timer, ADCCLK from MODCLK, single-channel mode
ADCCTL2 |= ADCPDIV__4 | ADCRES_1;   // 10-bit conversion results, ADCCLK = MODCLK/4, unsigned data, 200ksps
ADCMCTL0 |= ADCINCH_12 | ADCSREF_1; // Channel A12 (temp sensor), V(R+)=VREF=1.5V, V(R-)=AVSS

ADCIE |= ADCIE0; // Enable ADC interrupt

// Start ADC
ADCCTL0 &= ~ADCENC;
ADCCTL0 |= ADCON;
ADCCTL0 |= ADCENC | ADCSC;

// Temperature readout (inside ADC ISR)
ADCCTL0 &= ~ADCENC;
ADCCTL0 = ADCON_0;// Turn ADC off

uint16_t temperature;
temperature = 30 + ((ADCMEM0 - ADC_TC_15V_30C)*(85 - 30))/(ADC_TC_15V_85C - ADC_TC_15V_30C);

Am I correct in using the calibration values like this?

The datasheet states (link) that "The temperature sensor offset can vary significantly. TI recommends a single-point calibration to minimize the offset error of the built-in temperature sensor." but I don't understand if this is meant to be done in addition tothe calibration that is already provided.

Thank you for any help on the matter.