check other approach

frontend/pweb/lib/main.dart

@@ -57,12 +57,8 @@ void main() async {
         ChangeNotifierProvider(create: (_) => LocaleProvider(null)),
         ChangeNotifierProvider(create: (_) => AccountProvider()),
         ChangeNotifierProxyProvider<AccountProvider, TwoFactorProvider>(
-          create: (context) => TwoFactorProvider(
-            accountProvider: context.read<AccountProvider>(),
-          ),
-          update: (context, accountProvider, previous) => TwoFactorProvider(
-            accountProvider: accountProvider,
-          ),
+          create: (_) => TwoFactorProvider(),
+          update: (context, accountProvider, provider) => provider!..update(accountProvider),
         ),
         ChangeNotifierProvider(create: (_) => OrganizationsProvider()),
         ChangeNotifierProvider(create: (_) => CarouselIndexProvider()),

frontend/pweb/lib/pages/2fa/page.dart

@@ -1,15 +1,14 @@
 import 'package:flutter/material.dart';
 
+import 'package:provider/provider.dart';
+
 import 'package:pweb/pages/2fa/error_message.dart';
 import 'package:pweb/pages/2fa/input.dart';
 import 'package:pweb/pages/2fa/prompt.dart';
 import 'package:pweb/pages/2fa/resend.dart';
-
-import 'package:pweb/generated/i18n/app_localizations.dart';
-
-import 'package:provider/provider.dart';
 import 'package:pweb/providers/two_factor.dart';
 
+import 'package:pweb/generated/i18n/app_localizations.dart';
 
 
 class TwoFactorCodePage extends StatelessWidget {

frontend/pweb/lib/providers/two_factor.dart

@@ -9,9 +9,9 @@ import 'package:pshared/service/verification.dart';
 
 class TwoFactorProvider extends ChangeNotifier {
   static final _logger = Logger('provider.two_factor');
-  final AccountProvider _accountProvider;
+  late AccountProvider _accountProvider;
 
-  TwoFactorProvider({required AccountProvider accountProvider}) : _accountProvider = accountProvider;
+  TwoFactorProvider();
 
   bool _isSubmitting = false;
   bool _hasError = false;
@@ -24,6 +24,9 @@ class TwoFactorProvider extends ChangeNotifier {
   String? get errorMessage => _errorMessage;
   PendingLogin? get pendingLogin => _accountProvider.pendingLogin;
 
+  void update(AccountProvider accountProvider) {
+    _accountProvider = accountProvider;
+  }
 
   Future<void> submitCode(String code) async {
     _isSubmitting = true;