SEN0390 ambient light lux sensor with multiple I2C

When using a single SEN0390 with a MKR1010 board I get good readings from the sensor. When I also connect an HDC1080 sensor via I2C I am getting a lux value of -1 and the default non reading on the HDC1080. If I use the HDC1080 by itself it works fine.
 

When I do an I2C scan using https://playground.arduino.cc/Main/I2cScanner/ the address for the SEN0390 seems to be 0x4A (I thought it would be 0x94 based on library on GitHub (line 35 of DFROBOT_B_LUX_V30B.h) at https://github.com/DFRobot/DFRobot_B_LUX_V30B

Not sure what else to try - any suggestions?

Code I am trying on MKR1010 is below:

#include <DFRobot_B_LUX_V30B.h>

#include <Wire.h> // used for HDC1080 temp / hum sensor

#include "Adafruit_HDC1000.h"

DFRobot_B_LUX_V30B myLux(13);

Adafruit_HDC1000 hdc = Adafruit_HDC1000();

void setup() {

 Serial.begin(115200); 

 myLux.begin();

 if (!hdc.begin()) {

  Serial.println("Couldn't find sensor!");

  while (1);

 }

}

void loop() {

 Serial.print("Light: ");

 Serial.print(myLux.lightStrengthLux());

 Serial.print(" - Temperature: ");

 Serial.print(hdc.readTemperature());

 Serial.print(" - Humidity: ");

 Serial.println(hdc.readHumidity());

 delay(1000);

}