Arducam 12MP*2 Synchronized Stereo Camera Bundle with RPi 4 camera not detected

No response from Arducam, but posting this in case anyone else needs to know. On RaspberryPi 4B, if you cannot get your 12MP*2 Synchronized Stereo Camera Bundle working, you need to use i2cset. A couple of minutes of trial and error today got me to the answer I needed. i2cset -y 0x24 0x24 0x00 puts the camera hat in stereo mode with the feed from both cameras passed to the operating system as if from a single camera.