Enable background location on IOS with React Native Expo

im trying to track user location on IOS but it always keeps being denied. I have added all necessary dependencies in the app.json file but i keep getting the same error message saying :

[Unhandled promise rejection: Error: One of the NSLocation*UsageDescription keys must be present in Info.plist to be able to use geolocation.]

I have to mention this code works perfectly on android.
Does anyone have any idea what im doing wrong?