Walle/views/site/emailConfirmationFailed.php

<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;

/**
 * @var yii\web\View $this
 * @var yii\widgets\ActiveForm $form
 * @var \frontend\models\User $model
 */
$this->title = 'Signup';
$this->params['breadcrumbs'][] = $this->title;
$params = Yii::$app->params;
?>
<div class="site-signup alert alert-danger">
    <h1>Could not complete registration</h1>

    <p>You either supplied an invalid confirmation link or the link has meanwhile expired.
    Please contact our support under <?= Html::mailTo($params['support.name'], $params['support.email']) ?>.
    </p>

</div>