Add MKRNB library and basic connection header to sketch (lines 18, 26-28 and 48-46 of this sketch)
After adding the MKRNB lines on step 4, neither I2C library would get past the sensor .begin() line. I was able to duplicate the error by loading a blank sketch on the board and repeating steps 1-4 for both sensors, but I didn't get further than that. Sadly, I had no other I2C sensors in the house to test with.
I have not been able to connect to I2C devices on a MKR1500. The I2C device seems to stop responding after the MKRNB library is added to the sketch. I used a TCS34725 I2C light sensor to test, and tested with the Adafruit TCS34725 lib and Hideaki Tai's library.
Steps to test:
After adding the MKRNB lines on step 4, neither I2C library would get past the sensor .begin() line. I was able to duplicate the error by loading a blank sketch on the board and repeating steps 1-4 for both sensors, but I didn't get further than that. Sadly, I had no other I2C sensors in the house to test with.