Issue #3393464: TfaTrustedBrowser::validateForm() missing return statement.

src/Plugin/Tfa/TfaTrustedBrowser.php

@@ -146,6 +146,7 @@ final class TfaTrustedBrowser extends TfaBasePlugin implements TfaLoginInterface
    * {@inheritdoc}
    */
   public function validateForm(array $form, FormStateInterface $form_state): bool {
+    return TRUE;
   }
 
   /**