EZO sensor not working

[TeRRia]

Hello,

KC868-E16P is a great product, I love it!

I am almost finished connecting all my sensors and devices using ESPHome. 

Only remains 2 EZO sensors (1 device is pH, the other ORP). This is from Atlas Scientific:   EZO™ pH Circuit | Atlas Scientific (atlas-scientific.com)

I found this code on  EZO sensor circuits — ESPHome
- platform: ezo
  id: ph_ezo
  address: 99
  unit_of_measurement: "pH"
  update_interval: 10s

The device is connected to SDA / SCL.

Problem:
- Results from i2c bus scan doesn't detect the EZO sensor (I know the SDA / SCL ports are OK since I am able to detect an additional PCF8574 board for instance).
- While the device isn't detected, it is somehow interfering with ESP32 since I am seeing this in the logs:
                [W] [component: 157]: Component pcf8574 set Warning flag: unspecified
                [W] [component: 170]: Component pcf8574 cleared Warning flag

Questions:
- How to make my EZO sensor work please ?
- For my second  EZO sensor, should I connect it to the IC2 extender ?

Thank you.