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Newly purchased SGP30 sensor is not working with current builds of Tasmota.
To diagnose and confirm the sensor was not broken I tested the SGP30 example sketch in the Arduino IDE. This worked fine.
I noticed the Adafruit_SGP30 library used by Tasmota is 1.0.3 vs 1.2.0 current version in manage libs of arduino ide.
I tested the example sketch with a downgraded version of Adafruit_SGP30 to 1.0.3. The sketch would not work and could not find the sensor.
Having confirmed that the old library version is incompatible/broken with my sensor I compiled a sensors bin of tasmota with Adafruit_SPG30 upgraded to 1.2.0 - the sensor then started working in Tasmota.
TLDR; In summary - the current Adafruit_SGP30 lib referenced in Tasmota is broken for some versions of the SGP30 device. The Adafruit_SGP30 library needs to be upgraded to latest 1.2.0.
SGP30 Sensor Purchased: https://www.aliexpress.com/item/4000575428246.html