diff --git a/plugin/whispeakauth/Controller/AuthenticationController.php b/plugin/whispeakauth/Controller/AuthenticationController.php
index 1fa1841b75..831736ab88 100644
--- a/plugin/whispeakauth/Controller/AuthenticationController.php
+++ b/plugin/whispeakauth/Controller/AuthenticationController.php
@@ -120,6 +120,8 @@ class AuthenticationController extends BaseController
         $userId = api_get_user_id();
         $user2fa = ChamiloSession::read(WhispeakAuthPlugin::SESSION_2FA_USER, 0);
 
+        $result = [];
+
         if (!empty($user2fa) || !empty($userId)) {
             $isAllowed = !empty($_FILES['audio']);
         } else {
@@ -191,6 +193,18 @@ class AuthenticationController extends BaseController
 
             $message = $this->plugin->get_lang('AuthentifyFailed');
 
+            $authTokenRequest = new ApiRequest();
+            $authTokenResponse = $authTokenRequest->createAuthenticationSessionToken($user);
+
+            if (empty($authTokenResponse['text'])) {
+                $varNumber = mt_rand(1, 6);
+                $authTokenResponse['text'] = $this->plugin->get_lang("AuthentifySampleText$varNumber");
+            }
+
+            $result['text'] = $authTokenResponse['text'];
+
+            ChamiloSession::write(WhispeakAuthPlugin::SESSION_SENTENCE_TEXT, $authTokenResponse['token']);
+
             ChamiloSession::write(WhispeakAuthPlugin::SESSION_FAILED_LOGINS, ++$failedLogins);
 
             if ($maxAttempts && $failedLogins >= $maxAttempts) {
@@ -220,7 +234,7 @@ class AuthenticationController extends BaseController
             }
         }
 
-        echo Display::return_message(
+        $result['resultHtml'] = Display::return_message(
             $message,
             $success ? 'success' : 'warning',
             false
@@ -230,11 +244,11 @@ class AuthenticationController extends BaseController
             ChamiloSession::erase(WhispeakAuthPlugin::SESSION_FAILED_LOGINS);
 
             if (!empty($lpItemInfo)) {
-                echo '<script>window.location.href = "'
+                $result['resultHtml'] .= '<script>window.location.href = "'
                     .api_get_path(WEB_PLUGIN_PATH)
                     .'whispeakauth/authentify_password.php";</script>';
 
-                exit;
+                return $result;
             }
 
             if (!empty($quizQuestionInfo)) {
@@ -242,14 +256,14 @@ class AuthenticationController extends BaseController
 
                 ChamiloSession::write(WhispeakAuthPlugin::SESSION_AUTH_PASSWORD, true);
 
-                echo "<script>window.location.href = '".$url."';</script>";
+                $result['resultHtml'] .= "<script>window.location.href = '".$url."';</script>";
 
-                exit;
+                return $result;
             }
 
-            echo '<script>window.location.href = "'.api_get_path(WEB_PATH).'";</script>';
+            $result['resultHtml'] .= '<script>window.location.href = "'.api_get_path(WEB_PATH).'";</script>';
 
-            exit;
+            return $result;
         }
 
         if ($success) {
@@ -267,9 +281,9 @@ class AuthenticationController extends BaseController
                     $lpItemInfo['lp']
                 );
 
-                echo '<script>window.location.href = "'.$lpItemInfo['src'].'";</script>';
+                $result['resultHtml'] .= '<script>window.location.href = "'.$lpItemInfo['src'].'";</script>';
 
-                exit;
+                return $result;
             }
 
             if (!empty($quizQuestionInfo)) {
@@ -285,9 +299,9 @@ class AuthenticationController extends BaseController
                     $quizQuestionInfo['quiz']
                 );
 
-                echo '<script>window.location.href = "'.$url.'";</script>';
+                $result['resultHtml'] .= '<script>window.location.href = "'.$url.'";</script>';
 
-                exit;
+                return $result;
             }
 
             if (empty($lpItemInfo) && empty($quizQuestionInfo)) {
@@ -308,8 +322,12 @@ class AuthenticationController extends BaseController
             ChamiloSession::write('_user', $loggedUser);
             Login::init_user($user->getId(), true);
 
-            echo '<script>window.location.href = "'.api_get_path(WEB_PATH).'";</script>';
+            $result['resultHtml'] .= '<script>window.location.href = "'.api_get_path(WEB_PATH).'";</script>';
+
+            return $result;
         }
+
+        return $result;
     }
 
     /**
diff --git a/plugin/whispeakauth/Controller/EnrollmentController.php b/plugin/whispeakauth/Controller/EnrollmentController.php
index f08bd27af0..6a7bbb4c02 100644
--- a/plugin/whispeakauth/Controller/EnrollmentController.php
+++ b/plugin/whispeakauth/Controller/EnrollmentController.php
@@ -48,6 +48,8 @@ class EnrollmentController extends BaseController
      */
     public function ajax()
     {
+        $result = ['resultHtml' => ''];
+
         if (!$this->plugin->toolIsEnabled() || empty($_FILES['audio'])) {
             throw new \Exception(get_lang('NotAllowed'));
         }
@@ -63,13 +65,28 @@ class EnrollmentController extends BaseController
         }
 
         $request = new ApiRequest();
-        $response = $request->createEnrollment($token, $audioFilePath, $user);
+
+        try {
+            $response = $request->createEnrollment($token, $audioFilePath, $user);
+        } catch (\Exception $exception) {
+            $enrollTokenRequest = new ApiRequest();
+            $enrollTokenResponse = $enrollTokenRequest->createEnrollmentSessionToken($user);
+
+            \ChamiloSession::write(\WhispeakAuthPlugin::SESSION_SENTENCE_TEXT, $enrollTokenResponse['token']);
+
+            return [
+                'resultHtml' => \Display::return_message($exception->getMessage(), 'error'),
+                'text' => $enrollTokenResponse['text'],
+            ];
+        }
 
         \ChamiloSession::erase(\WhispeakAuthPlugin::SESSION_SENTENCE_TEXT);
 
         $this->plugin->saveEnrollment($user, $response['speaker']);
 
-        echo \Display::return_message($this->plugin->get_lang('EnrollmentSuccess'), 'success');
+        $result['resultHtml'] .= \Display::return_message($this->plugin->get_lang('EnrollmentSuccess'), 'success');
+
+        return $result;
     }
 
     /**
diff --git a/plugin/whispeakauth/ajax/record_audio.php b/plugin/whispeakauth/ajax/record_audio.php
index f0d8bf9458..946f29821a 100644
--- a/plugin/whispeakauth/ajax/record_audio.php
+++ b/plugin/whispeakauth/ajax/record_audio.php
@@ -17,11 +17,15 @@ if ($isEnrollment) {
 
     $controller = new EnrollmentController();
 
+    header('Content-Type: application/json');
+
     try {
-        $controller->ajax();
+       echo json_encode($controller->ajax());
     } catch (Exception $exception) {
-        WhispeakAuthPlugin::displayNotAllowedMessage(
-            $exception->getMessage()
+        echo json_encode(
+            [
+                'resultHtml' => Display::return_message($exception->getMessage(), 'error', false),
+            ]
         );
     }
     die;
@@ -30,9 +34,15 @@ if ($isEnrollment) {
 if ($isAuthentify) {
     $controller = new AuthenticationController();
 
+    header('Content-Type: application/json');
+
     try {
-        $controller->ajax();
+        echo json_encode($controller->ajax());
     } catch (Exception $exception) {
-        echo Display::return_message($exception->getMessage(), 'error', false);
+        echo json_encode(
+            [
+                'resultHtml' => Display::return_message($exception->getMessage(), 'error', false),
+            ]
+        );
     }
 }
diff --git a/plugin/whispeakauth/assets/js/RecordAudio.js b/plugin/whispeakauth/assets/js/RecordAudio.js
index 796ccf6353..fa6032ff40 100644
--- a/plugin/whispeakauth/assets/js/RecordAudio.js
+++ b/plugin/whispeakauth/assets/js/RecordAudio.js
@@ -43,7 +43,11 @@ window.RecordAudio = (function () {
                     btnStop.prop('disabled', true).text(btnStop.data('loadingtext'));
                 }
             }).done(function (response) {
-                $('#messages-deck').html(response);
+                if (response.text) {
+                    $('#txt-sample-text').text(response.text);
+                }
+
+                $('#messages-deck').html(response.resultHtml);
 
                 if ($('#messages-deck > .alert.alert-success').length > 0) {
                     tagAudio.parents('#audio-wrapper').addClass('hidden').removeClass('show');
diff --git a/plugin/whispeakauth/view/record_audio.html.twig b/plugin/whispeakauth/view/record_audio.html.twig
index 782d3c105a..aa8e30710e 100644
--- a/plugin/whispeakauth/view/record_audio.html.twig
+++ b/plugin/whispeakauth/view/record_audio.html.twig
@@ -8,7 +8,7 @@
                         <span class="fa fa-microphone fa-5x fa-fw" aria-hidden="true"></span>
                     </div>
                     <div class="col-sm-9 text-center">
-                        <p class="lead">{{ sample_text }}</p>
+                        <p class="lead" id="txt-sample-text">{{ sample_text }}</p>
                     </div>
                 </div>
             </div>