Have you seen this Help Article that JacobT_81 put together: Leveraging TAG4 to better understand the WICED Smart Programming Environment
If you scroll down, there is a section on interfacing over I2C with sensors.
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Please pull P8 high in the firmware in order to bring out i2c onto the pins.
The headers on the board are cut off from the MCU by the i2c expander. P8 is an output enable pin for this i2c expander.
I assume you mean GPIO P8/P33...I am setting that high, but still no I2C communication on J9. Anything else I could be missing?
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In addition to pulling P8 high, you'll also need pull P2 low. Sorry for the confusion on this--referenced an older schematic where this wasn't necessary.