I’m having an issue with Firebase where I keep getting the error: “An internal error has occurred. [ API key not valid. Please pass a valid API key. ]”.

Here’s what I’ve tried so far:

• Verified the API key in the Firebase Console.
• Checked API key restrictions in Google Cloud Console.
• Made sure all required APIs are enabled.
• Regenerated the API key and updated the configuration files.
• Updated Firebase dependencies.
• Checked for any network-related issues.

Despite these efforts, the problem persists. Has anyone experienced this before or have any suggestions on what I might be missing?

Thanks in advance for your help!

import 'dart:ui';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:instaapp/screens/sign_up.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
      options: FirebaseOptions(
    apiKey: 'key',
    appId: 'id',
    messagingSenderId: 'sendid',
    projectId: 'myapp',
    storageBucket: 'myapp-b9yt18.appspot.com',
  ));
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Insta App',
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: Colors.black),
      debugShowCheckedModeBanner: false,
      home: const signup(),
    );
  }
}

import 'dart:io';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:instaapp/screens/navigator_bar.dart';

class signup extends StatefulWidget {
  const signup({super.key});

  @override
  State<signup> createState() => _signupState();
}

class _signupState extends State<signup> {
  final name = TextEditingController();
  final email = TextEditingController();
  final password = TextEditingController();

  void signUp() async {
    try {
      await FirebaseAuth.instance.createUserWithEmailAndPassword(
          email: email.text, password: password.text);
      Navigator.of(context)
          .pushReplacement(MaterialPageRoute(builder: (context) {
        return NavigatorBar();
      }));
    } on FirebaseAuthException catch (error) {
      ScaffoldMessenger.of(context)
          .showSnackBar(SnackBar(content: Text(error.toString())));
    }
  }

  @override
  void dispose() {
    name.dispose();
    email.dispose();
    password.dispose();
    super.dispose();
  }

  final GlobalKey<FormState> formKey = GlobalKey<FormState>();
  File? _image;
  void selectedImage() async {
    var image = await ImagePicker().pickImage(source: ImageSource.gallery);
    if (image != null) {
      setState(() {
        _image = File(image.path);
      });
    } else {
      // Handle the case when the user doesn't pick an image
      setState(() {
        _image = null;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final h = MediaQuery.of(context).size.height;
    final w = MediaQuery.of(context).size.width;

    return SafeArea(
      child: Scaffold(
        resizeToAvoidBottomInset: false,
        body: Center(
          child: Column(
            children: [
              SizedBox(
                height: h * 0.1,
              ),
              const Text(
                'Insta App',
                style: TextStyle(
                    fontSize: 32,
                    color: Colors.white,
                    fontWeight: FontWeight.bold),
              ),
              SizedBox(
                height: h * 0.05,
              ),
              Stack(
                children: [
                  GestureDetector(
                    onTap: () {
                      selectedImage();
                    },
                    child: CircleAvatar(
                      radius: 50,
                      backgroundImage:
                          _image == null ? _image = null : FileImage(_image!),
                      backgroundColor: Colors.white,
                      child: _image == null
                          ? IconButton(
                              onPressed: () {
                                selectedImage();
                              },
                              icon: const Icon(
                                Icons.person,
                                color: Colors.grey,
                                size: 50,
                              ))
                          : null,
                    ),
                  ),
                ],
              ),
              SizedBox(
                height: h * 0.1,
              ),
              Form(
                  key: formKey,
                  child: Column(
                    children: [
                      Padding(
                        padding: EdgeInsets.symmetric(horizontal: h * 0.05),
                        child: TextFormField(
                          controller: name,
                          validator: (value) {
                            if (value!.isEmpty) {
                              return 'please enter your email';
                            }
                            return null;
                          },
                          decoration: const InputDecoration(
                            hintText: 'Name',
                            focusedBorder: OutlineInputBorder(
                                borderSide: BorderSide(color: Colors.white)),
                            enabledBorder: OutlineInputBorder(
                                borderSide: BorderSide(
                              color: Colors.grey,
                            )),
                          ),
                        ),
                      ),
                      SizedBox(
                        height: h * 0.01,
                      ),
                      Padding(
                        padding: EdgeInsets.symmetric(horizontal: h * 0.05),
                        child: TextFormField(
                          controller: email,
                          validator: (value) {
                            if (value!.isEmpty) {
                              return 'please enter an email';
                            }
                            return null;
                          },
                          decoration: const InputDecoration(
                            hintText: 'Email',
                            focusedBorder: OutlineInputBorder(
                                borderSide: BorderSide(color: Colors.white)),
                            enabledBorder: OutlineInputBorder(
                                borderSide: BorderSide(
                              color: Colors.grey,
                            )),
                          ),
                        ),
                      ),
                      SizedBox(
                        height: h * 0.01,
                      ),
                      Padding(
                        padding: EdgeInsets.symmetric(horizontal: h * 0.05),
                        child: TextFormField(
                          controller: password,
                          validator: (value) {
                            if (value!.isEmpty) {
                              return 'please enter a password';
                            }
                            return null;
                          },
                          decoration: const InputDecoration(
                            suffixIcon: Icon(Icons.visibility_off),
                            hintText: 'Password',
                            focusedBorder: OutlineInputBorder(
                                borderSide: BorderSide(color: Colors.white)),
                            enabledBorder: OutlineInputBorder(
                                borderSide: BorderSide(
                              color: Colors.grey,
                            )),
                          ),
                        ),
                      ),
                      SizedBox(
                        height: h * 0.01,
                      ),
                      SizedBox(
                        height: 50,
                        width: w * 0.7,
                        child: ElevatedButton(
                          onPressed: () {
                            if (formKey.currentState!.validate()) {
                              formKey.currentState!.save();
                            }
                            ;
                            signUp();
                          },
                          child: const Text(
                            'Send',
                            style: TextStyle(color: Colors.white),
                          ),
                        ),
                      ),
                      TextButton(
                          onPressed: () {},
                          child: const Text('Do you have an account?'))
                    ],
                  ))
            ],
          ),
        ),
      ),
    );
  }
}

im trying to sign up by firebase on my app and when i click send it give me this exception , i tried most solutions and my issue still exist

[internal error has occurred. [ API key not valid. Please pass a valid API key. ] flutter]