I am using the MAX20480 as per below schematic in one of my project for voltage monitoring.

I am able to read the registers as below, Able to read the correct CID, I2C address. And default register values as per datasheet.

I am unable to write the any read/write register. We want to set the nominal voltage to 2.5V for IN3, IN4 and IN5, 0.9V for IN1 and 1.65V for IN2. Also over voltage to 105% and undervoltage to 95%. Unable to do this. Please help me to solve this issue.