So I've just hooked up my CS to my mavic 2 pro but it is not showing height or distance when flying and connected to my phone via hotspot
Any ideas ?

Hi Patrick, just to verify, does the issue appear recently? You may try to restart all devices and check whether it works. If the issue persists, please kindly provide us with the App version, CrystalSky version and the issue screenshot for better assistance, thank you!