Hi Mark,
What I meant was, the SAMD21 on Odyssey board does not have pull-up resistors for I2C buses(not soldered on and SAMD21 internal pull-up is weak pull ups). I would recommend to have your own I2C pull-up resistors for your board.
Grove module itself has pull-up resistors on the module.
Yes, our team is still working on this, hope everything else working fine 