AlarmManager not starting when app is removed from the background - flutter

Question

I am trying to get the location data on some particular time. On every time we want to fetch the location data, we are sending a silent notification to our app. When app sees a silent notification It tries to get the data and upload back to the server. Every thing is working fine when app is running in foreground, but when i close the app and clear from the background, alarm manager is not getting fired to fetch and save the location.
_firebaseMessaging.configure(
onMessage: (
Map<String, dynamic> message,
) async {
final Map data =
message.containsKey('data') ? message['data'] as Map : null;
if (data?.isEmpty ?? false) {
_handleNotification(message);
} else {
_handleSilentEvent(message); // This method will be called when server will make call to fetch location data
}
},
onResume: (Map<String, dynamic> message) async {},
onLaunch: (Map<String, dynamic> message) async {},
onBackgroundMessage: _handleSilentEvent,
);
Future<dynamic> _handleSilentEvent(
final Map<String, dynamic> message,
) async {
final Map data = message.containsKey('data') ? message['data'] as Map : null;
if (data?.isNotEmpty ?? false) {
if (data.containsKey('getLocation')) {
await LocationService.triggerServiceToGetAndSaveLocation();
} else {
_handleWebEngage(data);
}
}
}
abstract class LocationService {
static const int _alarmManagerId = 1001;
static final ILocationFacade _locationFacade = getIt<ILocationFacade>();
LocationService._();
static Future<void> triggerServiceToGetAndSaveLocation() async {
AndroidAlarmManager.oneShotAt(
DateTime.now(),
_alarmManagerId,
LocationService._fetchAndSaveLocation,
wakeup: true,
exact: true,
);
}
static Future<void> _fetchAndSaveLocation() async {
final position = await _getCurrentLocation();
final capturedAt = DateTime.now().millisecondsSinceEpoch.toString();
final gpsEnabled = await Geolocator.isLocationServiceEnabled();
final LocationInfo locationInfo = LocationInfo(
lat: position.latitude,
lng: position.longitude,
capturedAt: capturedAt,
gpsEnabled: gpsEnabled,
);
print(
'onMessage:: Lat: ${position.latitude} Long: ${position.longitude} capturedAt: $capturedAt gpsEnabled: $gpsEnabled'); // This print is getting called when app is in foreground, when i kill the app this print is not event getting called.
// await _locationFacade.saveLocationInfo(locationInfo);
}
static Future<Position> _getCurrentLocation() async {
final _gpsServiceEnabled = await Geolocator.isLocationServiceEnabled();
if (_gpsServiceEnabled) {
return Geolocator.getCurrentPosition();
}
return Geolocator.getLastKnownPosition();
}
}
Can someone point me out where i am making the mistake?