receiving FCM registration token late in ios

Question

I am using react-native-fcm package to get FCM token.

FCM.getFCMToken()

When i install release/debug version of react native app on iPhone device, I am receiving FCM token after some time and not at app initialization(start up).

My package.json uses

"react": "16.0.0",
"react-native": "0.50.4",
"react-native-fcm": "git+https://github.com/evollu/react-native-fcm.git#sdk-26",
"react-native-firebase": "3.3.1",