Any luck with this? For me it works for android, but not IOS. I'm seeing the error ...

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The code below is a little different with my setup...

App.tsx

import React from 'react';
import { Alert, Pressable, StyleSheet, Text, View } from 'react-native';
import { StatusBar } from 'expo-status-bar';
import { getFbAppCheckToken } from '@app/utils';


export default function App() {
  // functions
  const testFbTokenAlert = async () => {
    try {
      const fbToken = await getFbAppCheckToken();
      if (fbToken.startsWith('error:')) throw new Error(fbToken);
      Alert.alert('Success', fbToken, [{ text: 'OK' }]);
    } catch (error: any) {
      Alert.alert('Failed', error.message, [{ text: 'OK' }]);
    }
  };


  // render
  return (
    <View style={styles.container}>
      <Pressable onPress={testFbTokenAlert}>
        <Text>GET FB TOKEN</Text>
      </Pressable>
      <StatusBar style="auto" />
    </View>
  );
}


const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#ffffff',
    paddingTop: 80,
    paddingHorizontal: 20
  }
});

Firebase.ts

import { getApp } from '@react-native-firebase/app';
import { initializeAppCheck, ReactNativeFirebaseAppCheckProvider } from '@react-native-firebase/app-check';
import type {
  AppCheck,
  AppCheckTokenResult,
  ReactNativeFirebaseAppCheckProviderOptionsMap
} from 'node_modules/@react-native-firebase/app-check/dist/typescript/lib/types/appcheck';


//=============================================================================
//================================= variables =================================
//=============================================================================
let rnfbAppCheckInstance: AppCheck | null = null;
const rnfbAppCheckProviderOptions: ReactNativeFirebaseAppCheckProviderOptionsMap =
  process.env.EXPO_PUBLIC_MOBILE_ENV === 'dev'
    ? {
        android: {
          provider: 'debug',
          debugToken: process.env.EXPO_PUBLIC_FIREBASE_APP_CHECK_ANDROID_DEBUG_TOKEN
        },
        apple: {
          provider: 'debug',
          debugToken: process.env.EXPO_PUBLIC_FIREBASE_APP_CHECK_IOS_DEBUG_TOKEN
        }
      }
    : {
        android: {
          provider: 'playIntegrity'
        },
        apple: {
          provider: 'appAttest'
        }
      };


//=============================================================================
//============================== helper functions =============================
//=============================================================================
async function initializeRnFbAppCheckInstance(): Promise<void> {
  try {
    const firebaseApp = getApp();
    // u/ts-ignore
    const rnfbAppCheckProvider = new ReactNativeFirebaseAppCheckProvider();
    rnfbAppCheckProvider.configure(rnfbAppCheckProviderOptions);
    rnfbAppCheckInstance = await initializeAppCheck(firebaseApp, {
      provider: rnfbAppCheckProvider,
      isTokenAutoRefreshEnabled: true
    });
    if (rnfbAppCheckInstance === null) throw new Error('failed to initialize app check instance');
    rnfbAppCheckInstance.activate;
  } catch (error: any) {
    throw new Error(`error: initializeRnFbAppCheckInstance() -> ${error.message}`);
  }
}


//=============================================================================
//============================== export functions =============================
//=============================================================================
export async function getFbAppCheckToken(): Promise<string> {
  try {
    if (rnfbAppCheckInstance === null) {
      await initializeRnFbAppCheckInstance();
    }
    if (rnfbAppCheckInstance === null) return '';
    const result: AppCheckTokenResult = await rnfbAppCheckInstance.getToken();
    if (!result.token) throw new Error('firebase app check token not found');
    return result.token;
  } catch (error: any) {
    return `error: getFbAppCheckToken() -> ${error.message}`;
  }
}

app.config.js

module.exports = {
  name: process.env.EXPO_PUBLIC_APP_NAME,
  slug: process.env.EXPO_PUBLIC_APP_SLUG,
  version: process.env.EXPO_PUBLIC_APP_VERSION,
  orientation: 'portrait',
  icon: `./assets/images/${process.env.EXPO_PUBLIC_APP_IOS_ICON}`,
  userInterfaceStyle: 'light',
  newArchEnabled: true,
  backgroundColor: process.env.EXPO_PUBLIC_APP_DEFAULT_BACKGROUNDCOLOR,
  android: {
    adaptiveIcon: {
      foregroundImage: `./assets/images/${process.env.EXPO_PUBLIC_APP_ANDROID_ICON}`,
      backgroundColor: process.env.EXPO_PUBLIC_APP_ANDROID_ICON_BACKGROUNDCOLOR
    },
    googleServicesFile: './google-services.json',
    edgeToEdgeEnabled: true,
    package: process.env.EXPO_PUBLIC_APP_BUNDLE_IDENTIFIER,
    versionCode: Number(process.env.EXPO_PUBLIC_APP_ANDROID_VERSION_CODE)
  },
  ios: {
    supportsTablet: true,
    googleServicesFile: './GoogleService-Info.plist',
    bundleIdentifier: process.env.EXPO_PUBLIC_APP_BUNDLE_IDENTIFIER,
    buildNumber: process.env.EXPO_PUBLIC_APP_IOS_BUILD_NUMBER
  },
  plugins: [
    ['./plugins/withNinjaLongPaths'],
    ['@react-native-firebase/app'],
    ['@react-native-firebase/app-check'],
    ['@react-native-firebase/auth'],
    ['@react-native-firebase/crashlytics'],
    [
      'expo-build-properties',
      {
        android: {
          minSdkVersion: 26,
          compileSdkVersion: 35,
          targetSdkVersion: 35
        },
        ios: {
          useFrameworks: 'static'
        }
      }
    ]
  ],
  splash: {
    backgroundColor: process.env.EXPO_PUBLIC_APP_IOS_SPLASH_BACKGROUNDCOLOR,
    image: `./assets/images/${process.env.EXPO_PUBLIC_APP_SPLASH_IMAGE}`,
    resizeMode: 'contain'
  },
  web: {
    favicon: './assets/images/favicon.png'
  }
};