CO2 sensor PTH-9CW is not in app device list

CO2 sensor PTH-9CW is not in app device list.
So it is impossible to connect to wifi.
That is the only reason I bought this device.
Is there another similar device I could try?
I tried the INK-CO2 which did not work.
Bad system design. It should be a generic INKBIRD device and specific one should be determined by the network rather than having a bad list of devices to choose from

Hello,
Please select ‘INK-CO2W’ model for connection.
Please understand that the WIFI indicator is only displayed and lit when connected to WIFI.
Please press the WIFI button of the device for 5 seconds before pairing, then follow the app’s instructions.
Please power up the device and place it next to the 2.4GHz wifi router.
Please make sure the phone is kept connected to 2.4GHz wifi during pairing, it will not automatically switch to 5GHz wifi or mobile network. When pairing, please place the device as close as possible to a 2.4GHz wifi router with Internet access.
The phone’s Bluetooth and location functions are turned on.
Please check the router settings if they are correct:
Wireless protocol: 802.11 b/g/n, but cannot be set to 11n only;
Security mode: WPA/WPA2
Authentication type: AES
Can it work?

Thanks for those details.
I had been doing it correctly.

The device I have is faulty so I will return to Amazon.