iOS Push Notifications Not Working with Firebase Cloud Messaging (FCM) - Build Issues

[yahyadogan]

Description: We are encountering two issues related to Firebase Cloud Messaging (FCM) on iOS. First, push notifications are not being received on iOS devices, despite proper configuration. Second, the build process is failing, preventing us from properly testing and deploying the app on iOS.

Steps to Reproduce:

Integrated FCM with React Native using @react-native-firebase/app and @react-native-firebase/messaging packages.

Followed the setup guide for FCM, including configuring Firebase, downloading the GoogleService-Info.plist, and adding it to the project.

Enabled Push Notifications and Background Modes in Xcode, as well as Remote Notifications under "Signing & Capabilities".

Tested the app on a real iOS device, as notifications don't work on simulators.

Build Issue:

The build is failing during the iOS build process.

The error message is: xcodebuild exited with error code '65'.

We also face errors related to modulemap not found, Redefinition of module 'ReactCommon', and React module issues during the build.

What We Have Tried:

Verified that the GoogleService-Info.plist is correctly placed and included in the project.

Ensured push notifications are properly requested using messaging().requestPermission().

Tested with actual devices (TestFlight) and confirmed bundle ID matches the one in Firebase.

Checked the notification payload, ensuring it's structured correctly.

Tried cleaning and rebuilding the Xcode project.

Updated dependencies for @react-native-firebase/app and @react-native-firebase/messaging.

Expected Behavior: Push notifications should be received on iOS devices when sent from Firebase, and the app should build successfully.

Actual Behavior:

Push notifications are not being received on iOS devices, despite proper configuration.

The build process fails with multiple errors related to module issues.

Additional Information:

The issue persists even after following the official documentation.

Notifications work fine on Android devices, suggesting the issue is specific to iOS.

The build process fails due to module conflicts and missing modulemap files.

Environment:

React Native version: 0.77.0

@react-native-firebase/app version: 21.14.0

@react-native-firebase/messaging version: 21.14.0

Xcode version: 16.3

iOS version: 18.4

Logs:

Error logs during the build process show the following:

xcodebuild exited with error code '65'
modulemap not found
Redefinition of module 'ReactCommon'
No such module 'React'

[mikehardy]

You've removed all the required file contents which would allow helping, despite those being requested if you ask for help, so I will close this.

Here is a script that will generate an iOS debug and release build that compiles correctly. You've done something wrong in your integration but this will allow you to compare a working build vs your incorrect integration and hopefully show the error

https://github.com/mikehardy/rnfbdemo/blob/main/make-demo.sh

If you are having issues with FCM delivery on iOS you'll want to make sure to include a notification block in your FCM, it is the only style of FCM that delivers reliably on iOS. Regardless, if the problem persists and you request help you'll want to include all the necessary information to troubleshoot - which in the case of FCM issues would be the actual FCM contents you are sending. You'll also want to make sure you've got all the correct entitlements and such in your iOS app and that you are testing on a real device, and that you use either Xcode console or Console.app to see the device logs as you send FCM to the device.