silly question. Have you followed the official docs? I've been using OneSignal for ~2 years, had a similar issue, but when going via the official guide, it worked in most cases: https://documentation.onesignal.com/docs/react-native-sdk-setup

If this is your first time setting it up, I recommend the docs. There is one tricky bit that needs to be done from Xcode for it to work correctly.