Route is not defined after successful log in - laravel

Question

little bit stuck with redirecting to other page after successful login for quite a long time. I believe that my understanding about sanctum auth is a bottleneck for this issue( Or maybe I am wrong ). However, after reading the docs still couldn't find the answer to my issue. Situation: I have declared few public routes and one private. I have created a user in my database and whenever I try successfully to log in it does not redirect to other page, and my credentials are 110% correct, but anyway after submit it only displays:
Symfony\Component\Routing\Exception\RouteNotFoundException
Route [/dashboard] not defined.
However, I have that route, it's protected but after sign in I assign it. Maybe I am doing in a wrong way?
welcome.blade:
#section('content')
<div class="container-fluid">
<div class="container">
<div class="form-group">
#if ($errors->any())
<div class="alert alert-danger">
#foreach ($errors->all() as $error)
<p>{{ $error }}</p>
#endforeach
</div>
#endif
<form action="{{action('App\Http\Controllers\AuthController#login')}}" method="POST">
#csrf
<input type="text" class="form-control" placeholder="Email address" name="username" required>
<input type="password" class="form-control" placeholder="Password" name="password" required>
<div class="login-btn">
<button type="submit" class="btn btn-success">Sign in</button>
</div>
</form>
</div>
</div>
</div>
#endsection
AuthController:
public function login(Request $request)
{
$fields = $request->validate([
'username' => 'required',
'password' => 'required',
]);
$user = User::where('username', $fields['username'])->first();
if (!$user || !Hash::check($fields['password'], $user->password)) {
return Redirect::back()->withInput()->withErrors('Incorrect username or password');
} else {
$token = $user->createToken($request->username);
return redirect()->route('/dashboard')->with('token', $token);
}
}
web.php :
// Private routing
Route::group(['middleware' => ['auth:sanctum']], function () {
// Agents dashboard
Route::get('/dashboard', function () {
return view('dashboard.main');
})->name('dashboard');
});
// Public routing
Route::get('/', function () {
return view('welcome');
});
Route::post('/login', [AuthController::class, 'login'])->name('login');
Dashboard -> main:
#extends('layouts.app')
#section('content')
<h1>Private</h1>
#endsection

Answer 1

change ->route('/dashboard') to ->route('dashboard'). This value references the name value on a route. eg:
Route::get('/dashboard', function () {
return view('dashboard.main');
})->name('dashboard');