Did you flash it with Betaflight? When you say "it doesn't show" do you just mean the tab isn't lit up? Power up and check the baro graph in your software and see if it shows any readings, blow on the sensor and see if the graph spikes. It's possible that it's working and just not showing. Also, I'm pretty sure that you have to be in alt hold mode for the baro to be activated. Plus I recall reading somewhere that the #970 baro sensor which I think is the one that the flip32 uses is not supported in Cleanflight, only Betaflight.