I was trying to show user a feedback message to in password reset by Email, But it's not working - flutter

Question

I'm creating a reset password page for my flutter app and I'm using showDialog for giving the feedback to the user to, but while running the code the message does not appear in screen, kindly check the code and tell me is there any mistate which I have made.
If anyone know the solution please help, I was trying to solve it but I can't find any solution.
The code is below:
class ForgotPasswordMailScreen extends StatefulWidget {
const ForgotPasswordMailScreen({Key? key}) : super(key: key);
#override
State<ForgotPasswordMailScreen> createState() =>
_ForgotPasswordMailScreenState();
}
final TextEditingController _email = TextEditingController();
class _ForgotPasswordMailScreenState extends State<ForgotPasswordMailScreen> {
final formKey = GlobalKey<FormState>();
bool loading = false;
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(
elevation: 0,
backgroundColor: Colors.transparent,
leading: IconButton(
onPressed: () {
Navigator.pop(context);
},
icon: const Icon(
Icons.arrow_back_ios_new,
color: Colors.blue,
),
),
),
body: SingleChildScrollView(
child: Container(
padding: const EdgeInsets.all(kDefaultSize),
child: Column(
children: [
const SizedBox(height: kDefaultSize * 4),
const FormHeaderWidget(
image: kForgotPasswordImage,
title: kForgotPassword,
subTitle: kForgotEmailTitle,
crossAxisAlignment: CrossAxisAlignment.center,
heightBetween: 10.0,
textAlign: TextAlign.center,
),
const SizedBox(height: kFormHeight),
Form(
key: formKey,
child: Column(
children: [
TextFormField(
controller: _email,
validator: (value) {
if (value!.isEmpty ||
!RegExp(r'^[\w-\.]+#([\w-]+\.)+[a-z]{2,5}$')
.hasMatch(value)) {
return 'Enter a valid email address.';
} else {
return null;
}
},
decoration: const InputDecoration(
label: Text(kEmail),
hintText: kEmail,
prefixIcon: Icon(Icons.mail_outline_rounded),
),
),
const SizedBox(height: 20.0),
SizedBox(
width: double.infinity,
child: ElevatedButton(
onPressed: () async {
if (formKey.currentState!.validate()) {
resetPassword();
formKey.currentState?.reset();
// _email.clear();
}
},
child: const Text(kNext),
),
),
],
),
),
],
),
),
),
),
);
}
// showLoadingScreen() {}
showMessage() {
showDialog(
context: context,
builder: (context) {
return const AlertDialog(
content: Text('Password reset link sent! Check your email.'),
);
});
}
showErrorMessage(String eMsg) {
showDialog(
context: context,
builder: (context) {
return AlertDialog(
content: Text(eMsg),
);
});
}
resetPassword() async {
showDialog(
context: context,
barrierDismissible: false,
builder: (context) => const Center(
child: CircularProgressIndicator(),
),
);
try {
await FirebaseAuth.instance
.sendPasswordResetEmail(email: _email.text.trim())
.then((value) {
Navigator.pop(context);
});
showMessage();
} on FirebaseAuthException catch (e) {
String error = e.message.toString();
showErrorMessage(error);
Navigator.pop(context);
}
}
}