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CakePHP version map

Flash plugin	branch	CakePHP core	PHP min
1.x [EOL]	cake3	3.8+	PHP 5.6
2.x	cake4	4.0+	PHP 7.2
3.x	master	5.x	PHP 8.1

Tips

Prevent AuthComponent to use its own "auth" flash key

only needed for older CakePHP 3.x versions:

$this->loadComponent('Auth', 
    ['flash' => ['key' => 'flash', 'element' => 'error']]);

Then your default layout can stay simple:

<?= $this->Flash->render() ?>