Use double quotes instead of single ones to build HTML code.

modules/consent/templates/consentform.php

@@ -124,7 +124,7 @@ foreach ($this->data['noData'] as $name => $value) {
 <?php
 if ($this->data['sppp'] !== false) {
     echo "<p>" . htmlspecialchars($this->t('{consent:consent:consent_privacypolicy}')) . " ";
-    echo "<a target='_blank' href='" . htmlspecialchars($this->data['sppp']) . "'>" . $dstName . "</a>";
+    echo '<a target="_blank" href="' . htmlspecialchars($this->data['sppp']) . '">' . $dstName . "</a>";
     echo "</p>";
 }