In the latest release of the Google Assistant SDK support for the Raspberry Pi Zero and Zero W was dropped.
But we have got it working again!
We will be uploading a video on the steps needed to replicate our results, but we were too excited not to tell you :)
UPDATE: Check out the latest! https://youtu.be/TIT01KGJZMU
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https://www.youtube.com/watch?v=kY6lFO3DZXM