Hi there,
So just as a test, I went external and connected a grove IMU Sure enough it works this way… LOL 
My guess is it will need a different LIB, I get an SPI divide clock error with the other Arduino or Seeed LIB 
so far I’m NOT a FAN of SIL…
Also I see the power IMU is on pin PD05 , Do we need to turn this ON to get it to work maybe? an Extra Step?
HTH
GL 
PJ 
I don’t like there is NO interrupt PIN connected either in the Schematic for this Bomb.
at Least the Xiao Nrf52840 Sense has THAT! 