Laravel 5.8: Two round passing data between controller and blade - redirect

Question

I am getting undefined variable when passing data from controller to blade the second time.
With Laravel 5.8, I have two actions/methods in a MyController. I have to pass data from controller to view. The first action works fine (MyController#action1 -> Blade1) but the second fails (MyController#action2 -> Blade2).
MyController:
public function action1()
{
...
$varialbe1 = ... // everything set correctly here and got it in blade1
return view('blade1', compact('variable1'));
}
public function action2(Request $request)
{
...
$association = $request->input('association');
return view('blade2', compact('association'));
}
Blade 1
<form method="POST" action="{{ route('route2') }}">
#csrf
<div class="form-group row">
<label for="association" class="col-md-4 col-form-label text-md-right">{{ __('Association') }}</label>
<div class="col-md-6">
<select required="required" id="association" class="form-control" name="association">
<option></option>
#foreach ($variable1 as $key => $val)
<option value="{{ $key }}">{{ $val->id }}</option>
#endforeach
</select>
</div>
</div>
<div class="form-group row mb-0">
<div class="col-md-8 offset-md-4">
<button type="submit" class="btn btn-primary">
{{ __('Submit') }}
</button>
</div>
</div>
</form>
Route
Route::post('/route2', 'MyController#action2')->name('route2');
Blade 2 (Undefined variable: association)
{{ $association }}
I have tried different ways to get data in MyController and different to pass data to Blade2 (the way that also works fine with the action1), including:
$association = Input::get('association');
return redirect()->to('/route2')->with('association', $association); // where route2 load the view

Answer 1

My route file seems good (MyController in the previous post = LoginController). Here is my route/web.php:
Route::get('/', function () {
return view('welcome');
});
Auth::routes();
Route::get('/home', 'HomeController#index')->name('home');
Route::post('/route2', 'Auth\LoginController#action2')->name('route2');

Answer 2

Got resolved from another forum.
Should add the action method to the list of exception methods in the middleware as follow:
$this->middleware('guest')->except(['logout', 'action']);
As controller has the below middleware in the constructor:
$this->middleware('guest')->except('logout');
If the User is already logged in, which is the case, they will be redirected to the /home and the controller method will never be reached.