iPhone can’t allow Location Services for App

My application uses iPhone's GPS functionality, and it was working fine previously, as in it prompts user to allow the use of location services and it shows up under Settings > Location Services list. I uninstalled and re-downloaded the app from the app store, but it no longer does either of them. The app was of the same version, and hasn't been updated for a while, but the problem had started recently.

I am on iPhone 13 and iOS 15