How can I solve 404 errors in Laravel 7?

I'm making a registration form using Laravel 7, my form has a "preview" step where users first check the details and either submit the details as they are or edit. The actual submission of the details happens in the blade file named preview.blade.php and this is where I have placed the form action for posting the data. This part works well, the edit part is the one with the problem as it gives 404 error. Please help.

In my register.blade.php:

                 <form method="post" action="{{ url('/preview-details') }}" id="regForm">
                    {{ csrf_field() }}
                
                    <div class="form-group">
                    <label for="region">Your Region</label><span class="text-danger">*</span>
                    <input type="text" class="form-control" name="region" id="region" placeholder="e.g Westlands" required>
                    </div>
                    
                    <label for="start_date">Date</label><span class="required">*</span>
                    <input type="date" class="form-control" id="start_date"  name="start_date" 
                    value="{{ old('start_date') }}" required>
                    
                    <!--Other fields here-->    
                </form>

In my preview.blade.php:

                <div>
                <a href="{{route('edit_preview')}}">
                <button type="button" class="btn btn-primary btn-sm"
                style="float:right;"><i class="fas fa-edit">&ensp;</i>Edit</button>
                </a>
                </div>
             <form method="post" action="{{ url('/client-registration') }}">
                {{ csrf_field() }}
                
                <div class="form-group">
                <label for="region">Your Region</label><span class="text-danger">*</span>
                <input type="text" class="form-control" name="region" id="region" placeholder="e.g Westlands" required>
                </div>

                <label for="start_date">Date</label><span class="required">*</span>
                <input type="date" class="form-control" id="start_date"  name="start_date" 
                value="{{ old('start_date') }}" required>

                <!--Other fields here-->    
            </form>

In my edit_preview.php (this one shows 404 error):

                 <form method="post" action="{{ url('/client-registration') }}">
                    {{ csrf_field() }}

                    <div class="form-group">
                    <label for="region">Your Region</label><span class="text-danger">*</span>
                    <input type="text" class="form-control" name="region" id="region" placeholder="e.g Westlands" required>
                    </div>

                    <label for="start_date">Date</label><span class="required">*</span>
                    <input type="date" class="form-control" id="start_date"  name="start_date" 
                    value="{{ old('start_date') }}" required>

                    <!--Other fields here-->    
                </form>

In my Routes file:

Route::get('/client-registration', 'Auth\Client\RegisterController@create')->name('client-registration');
Route::post('/client-registration', 'Auth\Client\RegisterController@store');
Route::post('/preview-details', 'Auth\Client\PreviewRegisterDetailsController@confirmation')->name('preview-details');
Route::post('/preview-details-existing', 'Auth\Client\PreviewDetailsExistingClientController@confirmation')->name('preview-existing');
Route::post('/edit_preview', 'Auth\Client\EditRegisterDetailsController@editDetails')->name('edit_preview');

In my Preview Controller (It works well):

    class PreviewRegisterDetailsController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest');
    }
   
    // Validating the User

    public function confirmation(Request $request)

    {

        $categories = Category::all();

        $request->validate([
            'first_name'            => 'required|string|max:255',
            'last_name'             => 'required|string|max:255',
            'telephone_number'      => 'required|digits:10',
            'email'                 => 'required|string|email|max:255|unique:users','regex:/^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,6}$/',
            'password'              => 'required|string|min:6|confirmed',
            'password_confirmation' => 'required',
            'region'                => 'required|string',
            'description'           => 'required|string|max:2500',
            'start_date'            => 'required|date',
            'client_region'         => 'string|max:500',
            'client_category'       => 'integer|max:255',
        ]);

        
        $data = $request->all();
        return view('auth.client.preview', compact('categories', 'data'));
}

}

In my edit details controller:

class EditRegisterDetailsController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest');
    }
   
    // Validating the User

    public function editDetails(Request $request)

    {

        $categories = Category::all();

        $request->validate([
            'first_name'            => 'required|string|max:255',
            'last_name'             => 'required|string|max:255',
            'telephone_number'      => 'required|digits:10',
            'email'                 => 'required|string|email|max:255|unique:users','regex:/^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,6}$/',
            'password'              => 'required|string|min:6|confirmed',
            'password_confirmation' => 'required',
            'region'                => 'required|string',
            'description'           => 'required|string|max:2500',
            'start_date'            => 'required|date',
            'client_region'         => 'string|max:500',
            'client_category'       => 'integer|max:255',
        ]);

        
        $data = $request->all();
        return view('auth.client.edit_preview', compact('categories', 'data'));
}

}