Tuya Temperature and Humididty does not see Humidity when setting scene

Hi.
I’m quite new to this but im trying to set my Temp/humidity sensor to start my dehumidifier when required.
When i go into the tuya app and set a scene it only displays the temp. I am getting data from the sensor on both temp and humidity just no option in the scene to use the humidity as a trigger.
Can anyone help?
Thanks