CCS/MSP430FR6989: I2C Scanner not working as expected

#include <msp430.h>
#include <msp430fr6989.h>
#include "utils.h"
#include "uart.h"
#include "pins.h"
#include "driverlib/driverlib.h"
#include <stdint.h>
#include <stdio.h>

int main(void){
    char buff[100];

    WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

    // Configure clock
    CSCTL0 = 0xA500; // "Password" to access clock calibration registers
    CSCTL1 = DCOFSEL_0 | DCORSEL; // Frequency of the main DCOCLK clock 8 MHz
    CSCTL2 = SELS_3 |  SELA_1;//DCOCLK as input CLK for SMCLK
    CSCTL3 = 0x0000; // No prescalers

    //Set UART and I2C pins
    GPIO_setAsPeripheralModuleFunctionInputPin(OV_SDA, GPIO_SECONDARY_MODULE_FUNCTION);
    GPIO_setAsPeripheralModuleFunctionInputPin(OV_SCL, GPIO_SECONDARY_MODULE_FUNCTION);
    GPIO_setAsPeripheralModuleFunctionInputPin(UART_RX,GPIO_PRIMARY_MODULE_FUNCTION);
    GPIO_setAsPeripheralModuleFunctionInputPin(UART_TX,GPIO_PRIMARY_MODULE_FUNCTION);
    PMM_unlockLPM5();


    // UART configuration
    unsigned long divider =(1000000U <<4)/9600; //Do the division and with decimals (that's why we shift left)
    unsigned long mod = divider&0xFFF0; // UCBRFx = INT([(N/16) -INT(N/16)] - 16) (you can check that the operation in the code corresponds to the bit stuff
    divider>>=8; // remove decimals
    UCA0CTLW0 = UCSWRST; // Put UART into SoftWare ReSeT
    UCA0CTLW0 = UCA0CTLW0 | UCSSEL_2; // Specifies clock source for UART // aclk
    UCA0BR0 = divider;
    UCA0BR1 = divider>>8;
    UCA0MCTLW = (unsigned char)( UCOS16 ) | mod; //use oversampling (divider > 16)
    UCA0CTLW0 = UCA0CTLW0 & (~UCSWRST); // Takes UART out of SoftWare ReSeT

    puts_uart0("Start!\r\n");

    // i2c configuration
    EUSCI_B_I2C_initMasterParam i2cConf = {0};
    i2cConf.selectClockSource = EUSCI_B_I2C_CLOCKSOURCE_SMCLK;
    i2cConf.i2cClk= CS_getSMCLK();
    i2cConf.dataRate=EUSCI_B_I2C_SET_DATA_RATE_400KBPS;
    i2cConf.autoSTOPGeneration = EUSCI_B_I2C_NO_AUTO_STOP;
    EUSCI_B_I2C_initMaster(EUSCI_B1_BASE, &i2cConf);
    EUSCI_B_I2C_enable(EUSCI_B1_BASE);

    uint8_t addr=0;
    while(1){
        EUSCI_B_I2C_setSlaveAddress(EUSCI_B1_BASE, addr);
        EUSCI_B_I2C_setMode(EUSCI_B1_BASE, EUSCI_B_I2C_TRANSMIT_MODE);
        if(EUSCI_B_I2C_masterSendSingleByteWithTimeout(EUSCI_B1_BASE, 0x00, 10)){
            sprintf(buff, "DEV FOUND AT 0x%02X\r\n",addr);
            puts_uart0(buff);
        };
        addr++;
        if(addr==0x8F){
            addr=0;
            puts_uart0("Round complete!\r\n");
        }
        __delay_cycles(100);
    }
}