I think there is a mistake in design CN0381 with the IOV_DD voltage regulator. The ADJ resistor pair for the ADP1720ARMZ-R7 is shows R1=57.6k and R2=27k. If I am reading ADP1720.pdf page 10 correctly, this produces a voltage of 3.8V instead of the desired 1.8V.
This would also exceed the IOV_DD to GND spec of max=3.6V on page 94 of ad7124-8.pdf.
Swapping them around would solve the problem.