Seeed: MPU950 DeviceID returns 0, MPU9250 Connection Failed, Calibration parameters are 0.0 0.0 0.0
Arduino Uno: MPU950 DeviceID returns 71, MPU9250 Connection successful, Calibration parameters are -1.00 27.00 -11.00
So all good on the Arduino Uno. Problem is something specific to the J4105.