How do I implement this code for android 6.0?

I have in an Fragmentimplemented Google APIand WORKS . But it works on my 3 phones which are jellybean , kitkat and lollipop . My friend's, which is 6.0 , does not work ... the map of GOOGLE API, yes, appears, but the coordinates do not appear, as if he had not put anything, only the map...

Because ? Where does it fail?

Clarification : If you are thinking of telling me to try MapFragmentthe application stops me, so that is not the solution, MapFragmentinstead of SupportMapFragmentit does not work for me in any situation, and what is implemented here below works:

public class Map_fragment extends Fragment implements OnMapReadyCallback {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.activity_map, container, false);

    SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager().findFragmentById(R.id.mapid);
    mapFragment.getMapAsync(this);

    return v;
}

@Override
public void onMapReady(GoogleMap map) {
    LatLng RudeBoys = new LatLng(39.4561165, -0.3545661);
    LatLng Malaga = new LatLng(36.6981483, -4.4513236);
    LatLng Melilla = new LatLng(35.2896931, -2.9427164);


    if (Build.VERSION.SDK_INT >= 23 &&
            ContextCompat.checkSelfPermission(getActivity(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
            ContextCompat.checkSelfPermission(getActivity(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }

    map.setMyLocationEnabled(true);
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(RudeBoys, 5)); // ZOOM AL EMPEZAR EL GOOGLE MAP

    // ¡¡ FOR EACH LOCATION I CAN USE DIFFERENT ICON AND DESCRIPTION , RAFA!!
    map.addMarker(new MarkerOptions()
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.box24))
            .title("Rude-Boys")
            .snippet("Tienda principal")
            .position(RudeBoys));

    map.addMarker(new MarkerOptions()
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.mapfinal))
            .title("CLUB DE LA LUCHA")
            .snippet("Málaga")
            .position(Malaga));

    map.addMarker(new MarkerOptions()
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.mapfinal))
            .title("ON FITNESS SHOP")
            .snippet("Melilla")
            .position(Melilla));    

}

}

<fragment
    android:id="@+id/mapid"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />