multi-select with relationship not returning data

Forms\Components\Select::make('receivers')
  ->label('Ontvanger')
  ->required()
  ->relationship('receiver', 'email')
  ->searchable()
  ->preload()
  ->multiple()
  ->options(Auth::user()->contacts()->pluck('email', 'id'))
  ->createOptionForm([
      Hidden::make('owner_id')
        ->default(Auth::id()),
      Hidden::make('owner_type')
        ->default(User::class),
      TextInput::make('name')
         ->label('Naam')
         ->required(),
      TextInput::make('email')
         ->required()
         ->email(),
]),

->action(function (array $data) {
    dd($data);
})