Go to Settings >> Tap on General >> Tap on Restrictions and Enter the Restrictions Passcode >> Under Allow Changes and Tap on Location >> Ensure Allow Changes is ticked. You may scroll down and ensure the particular app is allows to access Location Services.
Run the app again and see if it can determine your current location. If it still does not work, go to Step 3.
Go to Settings >> Tap on General >> Tap on Reset >> Tap on Reset Network Settings >> Enter the lock screen passcode and Tap on Reset Network Settings. your iOS Device will now restart.
Note: When you reset the Network Settings, all network settings such as Wi-Fi passwords, etc. will be set to factory defaults. You will have to re-enter these passwords in order to be able to access Wi-Fi networks previously configured.
Run the app again and it should be able to use the Location Services as normal.
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