LIS3MDL Magnetometer not recognized by Pixhawk 2.1 Cube

I just purchased three LIS3MDL Breakout Boards. It didn’t come with any documentation and I didn’t see any documentation on the website. Is there anything I need to do to integrate it with the Pixhawk Cube other than connecting it to the I2C bus through the JST connection? The Pixhawk does not seem to be recognizing the compass right now. Does it require external power, etc.?