Policy not applying on custom action

class EditDiscountAction extends Action
{
    protected function setUp(): void
    {
        parent::setUp();

        $this->name('edit-discount');

        $this->label('Edit Discount');

        $this->icon('heroicon-o-pencil');

        $this->slideOver();

        $this->modalHeading('Edit Discount');

        $this->modalSubmitActionLabel('Edit Discount');

        $this->modalFooterActionsAlignment(Alignment::End);

        $this->successNotificationTitle('Discount updated successfully.');

        $this->failureNotificationTitle('Something went wrong.');

        $this->modalWidth(MaxWidth::Medium);

        $this->fillForm(function (Model $record): array {
            return $record->attributesToArray();
        });

        $this->action(function (Model $record, array $data) {
           // action implementation
    }

    public function getForm(Forms\Form $form): ?Forms\Form
    {
        return DiscountForm::getFormFields($form);
    }
}