I experienced the same issue in react native but ifugured out what is the issue and here is the solution for it:
this is of not doing complete Configuration of google maps for iOS
add #import <GoogleMaps/GoogleMaps.h> and
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[GMSServices provideAPIKey:@"googlemaps api key"];
to the app delegate.mm file
AND
target 'project' do
rn_maps_path = '../node_modules/react-native-maps'
pod 'react-native-google-maps', :path => rn_maps_path
to podfile
then run pod install