KC868-A8: Read voltage on Analog Input A1 to A4 not working?

[svdstra]

Since the Inputs A1 to A4 have an internal pull up resistor the analog voltage should read 3V when the input is open. For some reason I am unable to read the voltage of a open input and it returns 0.075V.

Am I correct that the reading should read around 3V because of the internal Pull-up resistor?

The input config is:

sensor:
  - platform: adc
    pin: GPIO14
    name: "Analog Input A1"
    update_interval: 5s

What am I doing wrong?