Hi,
I haven't had a detailed look on the datasheet, but you are mentioning your result is 0x00. This corresponds only to 8 Bit, so at least 4 additional bits are missing here (I assume 8). This missing bits include your LSB"s", if the MSB is clocked out first. So depending on your test condition, which I do not know, and it looks like the inputs are floating, the floating/open ADC input "noise" (flipping of the lower bits) will not be displayed.
Further, for your read hex presentation I'm missing a digit (ending zero?): 2E 10A0 1X.
BR