LoginController.php

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<?php
namespace Magento\Security\Model\Plugin;

use Magento\Security\Model\AdminSessionsManager;
use Magento\Backend\Controller\Adminhtml\Auth\Login;

class LoginController
{
    private $messageManager;

    private $sessionsManager;

    private $securityCookie;

    public function __construct(
        \Magento\Framework\Message\ManagerInterface $messageManager,
        AdminSessionsManager $sessionsManager,
        \Magento\Security\Model\SecurityCookie $securityCookie
    ) {
        $this->messageManager = $messageManager;
        $this->sessionsManager = $sessionsManager;
        $this->securityCookie = $securityCookie;
    }

    public function beforeExecute(Login $login)
    {
        $logoutReasonCode = $this->securityCookie->getLogoutReasonCookie();
        if ($this->isLoginForm($login) && $logoutReasonCode >= 0) {
            $this->messageManager->addErrorMessage(
                $this->sessionsManager->getLogoutReasonMessageByStatus($logoutReasonCode)
            );
            $this->securityCookie->deleteLogoutReasonCookie();
        }
    }

    private function isLoginForm(Login $login)
    {
        return $login->getRequest()->getUri() == $login->getUrl('*');
    }
}