Google Coral Environmental Sensor Board reports NaN for all measurements - google-coral

When running the Google Coral Environmental Sensor Board on a fresh Raspbian install and fresh installation of the Google Coral Raspberry Pi library, all measurements are NaN (not a number) when running the Google demo code.
Is this an indication that the board is broken, even if the display works fine?
Reinstalled Raspbian OS on a Raspberry Pi 0 w and reinstalled Coral Raspberry Pi library.
Google demo code is here:
https://coral.googlesource.com/coral-cloud/+/refs/heads/master/python/coral-enviro/coral/enviro/enviro_demo.py
No errors reported

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