Hey Duby, Been a long time since I made this post and been here, but ensure you have either a proper 5V usb power to the NICLA (use different PCs or power supplies) or that your battery is charged if you are using the battery power. The waveform was not present for me with 5V over USB from my desktop PC, but worked with 5V over USB from my laptop, that was the only thing that changed between different "environments", and that fixed my I2C issues, and the waveform can seen on an oscilloscope, check the photo attached.
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