Accessing 16-bit registers through i2c

Question

Hello, I am currently working with VEML6035 light sensor and so far i had a hard time working with its 16-bit registers.

The code that i wrote:

uint8_t i2c_handler::write_16bit(uint8_t registerAddress, uint16_t data){
    uint8_t buff[3];
    buff[0] = registerAddress;
    buff[1] = data & 0xFF;
    buff[2] = (data >> 8) & 0xFF;
    uint8_t ret;
    ret = i2c_write_dt(_handler, buff,3);
    if (ret != 0) {
        printk("Failed to write to 16-bit register of I2C device at Reg. %x (error %d)\n", registerAddress,ret);
        return ret;
    }
    return 0;
}
uint8_t i2c_handler::read_16bit(uint8_t registerAddress, uint16_t* dataDestination){
    uint8_t ret;
    uint8_t data[2];
    ret = i2c_write_read_dt(_handler, &registerAddress, 1, data, 2);
    if (ret != 0) {
        printk("Failed to write/read 16-bit register of I2C device at Reg. %x  (error %d)\n", registerAddress,ret);
        return ret;
    }
    *dataDestination = (data[1]<<8) | data[0];
    printk("Data from read: %x \r\n",*dataDestination);
    return 0;
}

overlay file:

&i2c0 {
    status = "okay";
    clock-frequency = <I2C_BITRATE_STANDARD>;
    veml6035: veml6035@29{
        compatible = "i2c-device";
        reg = <0x29>;
        label = "VEML6035 Ambient Light Sensor";
    };
};

I can't get that to work. Returns error 251 on write/read. Is that a proper way of setting up writing/reading of 16-bit registers?