CCS811 Hardware ID reading issue

We are working on CO2 sensor from AMS sensor tech. The sensor part no is CCS811.
Connecting with STM32 and operating at I2C mode(100kHz) , we are trying to read the PART ID from the sensor.
We are reading the register address 0x20H and we got the response as 0x80H instead of 0x81H.
For reading the address the slave address we are using is 0xB5H.
Can you suggest any corrective action that has to be taken from our side?