MCP3564 - ADCDATA Always 0 But Can Read And Write Other Registers (LBound)

Hi, I seem to be unable to get any actual data out from my MPC3564. I am able to read and write to any of the other registers, but when reading from ADCDATA I always get 0 back. I've tried to change the MUX source to CH0-Agnd where I have a voltage, and h..