diff --git a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthFrontendCredentialsLTI.php b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthFrontendCredentialsLTI.php
index fbe2fc263deb..55828a4a3776 100644
--- a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthFrontendCredentialsLTI.php
+++ b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthFrontendCredentialsLTI.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * Auth credentials for lti oauth based authentication
  *
diff --git a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthProviderLTI.php b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthProviderLTI.php
index acaeedfb01f6..f2379aa606dd 100644
--- a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthProviderLTI.php
+++ b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilAuthProviderLTI.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * OAuth based lti authentication
  * @author Stefan Meyer <smeyer.ilias@gmx.de>
@@ -264,7 +264,13 @@ public function doAuthentication(\ilAuthStatus $status): bool
             return false;
         }
 
-        $this->ref_id = $this->provider->platform->getRefId();
+        $platformId = $this->messageParameters['platform_id'];
+        $clientId = $this->provider->platform->clientId;
+        $deploymentId = $this->messageParameters['deployment_id'];
+
+        $platform = ilLTIPlatform::fromPlatformId($platformId, $clientId, $deploymentId, $this->dataConnector);
+
+        $this->ref_id = $platform->getRefId();
         // stores ref_ids of all lti consumer within active LTI User Session
         $lti_context_ids = ilSession::get('lti_context_ids');
         // if session object exists only add ref_id if not already exists
@@ -298,41 +304,44 @@ public function doAuthentication(\ilAuthStatus $status): bool
         ilSession::set('lti_init_target', ilObject::_lookupType($this->ref_id, true) . '_' . $this->ref_id);
 
         // lti service activation
-        if (!$this->provider->platform->enabled) {
+        if (!$platform->enabled) {
             $this->getLogger()->warning('Consumer is not enabled');
             $status->setReason('lti_consumer_inactive');
             $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
             return false;
         }
         // global activation status
-        if (!$this->provider->platform->getActive()) {
+        if (!$platform->getActive()) {
             $this->getLogger()->warning('Consumer is not active');
             $status->setReason('lti_consumer_inactive');
             $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
             return false;
         }
-        $lti_id = $this->provider->platform->getExtConsumerId();
+        $lti_id = $platform->getExtConsumerId();
         if (!$lti_id) {
             $status->setReason('lti_auth_failed_invalid_key');
             $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATION_FAILED);
             return false;
         }
 
-        $this->getLogger()->debug('Using prefix:' . $this->provider->platform->getPrefix());
+        $this->getLogger()->debug('Using prefix:' . $platform->getPrefix());
+
+        // Use user_id as username instead of user email to avoid problems with uniqueness of the lti user.
+        $this->getCredentials()->setUsername($this->messageParameters['user_id']);
 
         $internal_account = $this->findUserId(
             $this->getCredentials()->getUsername(),
             (string) $lti_id,
-            $this->provider->platform->getPrefix()
+            $platform->getPrefix()
         );
 
         if ($internal_account) {
-            $this->updateUser($internal_account, $this->provider->platform);
+            $this->updateUser($internal_account, $platform);
         } else {
-            $internal_account = $this->createUser($this->provider->platform);
+            $internal_account = $this->createUser($platform);
         }
 
-        $this->handleLocalRoleAssignments($internal_account, $this->provider->platform);
+        $this->handleLocalRoleAssignments($internal_account, $platform);
 
         $status->setStatus(ilAuthStatus::STATUS_AUTHENTICATED);
         $status->setAuthenticatedUserId($internal_account);
@@ -427,12 +436,12 @@ protected function createUser(ilLTIPlatform $consumer): int
         $local_user = ilAuthUtils::_generateLogin($consumer->getPrefix() . '_' . $this->getCredentials()->getUsername());
 
         $newUser["login"] = $local_user;
-        if(isset($this->messageParameters['lis_person_name_given'])) {
+        if (isset($this->messageParameters['lis_person_name_given'])) {
             $newUser["firstname"] = $this->messageParameters['lis_person_name_given'];
         } else {
             $newUser["firstname"] = '-';
         }
-        if(isset($this->messageParameters['lis_person_name_family'])) {
+        if (isset($this->messageParameters['lis_person_name_family'])) {
             $newUser["lastname"] = $this->messageParameters['lis_person_name_family'];
         } else {
             $newUser["lastname"] = '-';
@@ -552,6 +561,11 @@ protected function handleLocalRoleAssignments(int $user_id, ilLTIPlatform $consu
         $role_arr = explode(',', $roles);
         foreach ($role_arr as $role_name) {
             $role_name = trim($role_name);
+            $role_name = str_replace('http://purl.imsglobal.org/vocab/lis/v2/membership#', '', $role_name);
+            $role_name = str_replace('http://purl.imsglobal.org/vocab/lis/v2/person#', '', $role_name);
+            $role_name = str_replace('http://purl.imsglobal.org/vocab/lis/v2/institution/person#', '', $role_name);
+            $role_name = str_replace('http://purl.imsglobal.org/vocab/lis/v2/system/person#', '', $role_name);
+
             switch ($role_name) {
                 case 'Administrator':
                     $this->getLogger()->info('Administrator role handling');
diff --git a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSetting.php b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSetting.php
index 1372cdf29d37..085524e9f7d1 100644
--- a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSetting.php
+++ b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSetting.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * Stores
  *
diff --git a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSettingGUI.php b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSettingGUI.php
index 1908a9d402af..94457e1dc79d 100644
--- a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSettingGUI.php
+++ b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTIProviderObjectSettingGUI.php
@@ -288,8 +288,8 @@ protected function initObjectSettingsForm(): \ilPropertyFormGUI
     protected function updateSettings(): void
     {
         $form = $this->initObjectSettingsForm();
+        $form->setValuesByPost();
         if (!$form->checkInput()) {
-            $form->setValuesByPost();
             $this->settings($form);
             return;
         }
diff --git a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTITool.php b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTITool.php
index e10b59e909d6..63fb783298c4 100644
--- a/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTITool.php
+++ b/components/ILIAS/LTIProvider/classes/InternalProvider/class.ilLTITool.php
@@ -41,14 +41,13 @@ class ilLTITool extends Tool
      */
     public function __construct(ilLTIDataConnector $dataConnector)
     {
-        global $DIC;
         $this->logger = ilLoggerFactory::getLogger('ltis');
         //        $this->initialize();
         if (empty($dataConnector)) {
             $dataConnector = ilLTIDataConnector::getDataConnector();
         }
         $this->dataConnector = $dataConnector;
-        //        parent::__construct($dataConnector);
+        //parent::__construct($dataConnector);
         $this->setParameterConstraint('resource_link_id', true, 50, array('basic-lti-launch-request'));
         $this->setParameterConstraint('user_id', true, 64, array('basic-lti-launch-request'));
         $this->setParameterConstraint('roles', true, null, array('basic-lti-launch-request'));
@@ -76,4 +75,13 @@ protected function onLaunch(): void
             $this->resourceLink->save();
         }
     }
+
+    public function handleRequest(bool $strictMode = null, bool $disableCookieCheck = false, bool $generateWarnings = false): void
+    {
+        global $DIC;
+
+        $_POST = $DIC->http()->request()->getParsedBody();
+        $_GET = $DIC->http()->request()->getQueryParams();
+        parent::handleRequest($strictMode, $disableCookieCheck, $generateWarnings);
+    }
 }
diff --git a/components/ILIAS/LTIProvider/classes/Setup/class.ilLTIDatabaseUpdateSteps.php b/components/ILIAS/LTIProvider/classes/Setup/class.ilLTIDatabaseUpdateSteps.php
index ac114259c4ae..68043d834343 100644
--- a/components/ILIAS/LTIProvider/classes/Setup/class.ilLTIDatabaseUpdateSteps.php
+++ b/components/ILIAS/LTIProvider/classes/Setup/class.ilLTIDatabaseUpdateSteps.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 class ilLTIDatabaseUpdateSteps implements ilDatabaseUpdateSteps
 {
     protected ilDBInterface $db;
diff --git a/components/ILIAS/LTIProvider/classes/class.ilGlobalTemplate.php b/components/ILIAS/LTIProvider/classes/class.ilGlobalTemplate.php
index 67918c3b96e4..820b9be1f769 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilGlobalTemplate.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilGlobalTemplate.php
@@ -1,6 +1,5 @@
 <?php
 
-declare(strict_types=1);
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -17,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 namespace LTI;
 
 /**
diff --git a/components/ILIAS/LTIProvider/classes/class.ilLTICronOutcomeService.php b/components/ILIAS/LTIProvider/classes/class.ilLTICronOutcomeService.php
index 334e7f70b76b..ed63cacbc3f4 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilLTICronOutcomeService.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilLTICronOutcomeService.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 use ILIAS\Cron\Schedule\CronJobScheduleType;
 
 /**
diff --git a/components/ILIAS/LTIProvider/classes/class.ilLTIDataConnector.php b/components/ILIAS/LTIProvider/classes/class.ilLTIDataConnector.php
index bf2e24008fdf..62372a0b520b 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilLTIDataConnector.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilLTIDataConnector.php
@@ -55,8 +55,9 @@ public function __construct()
      * @param Platform $platform Platform object
      * @return boolean True if the tool consumer object was successfully loaded
      */
-    public function loadPlatform(Platform $platform): bool
+    public function loadPlatform(Platform | ilLTIPlatform $platform): bool
     {
+
         $ok = false;
         $allowMultiple = false;
         $id = $platform->getRecordId();
@@ -146,8 +147,12 @@ public function loadPlatform(Platform $platform): bool
             $platform->created = strtotime($row->created);
             $platform->updated = strtotime($row->updated);
             //ILIAS specific
-            $platform->setExtConsumerId(intval($row->ext_consumer_id));
-            $platform->setRefId((int) $row->ref_id);
+            // Fix for ILIAS: Change method param type to union type Platform | ilLTIPlatform
+            // Then check if $platform is ilLTIPlatform
+            if ($platform instanceof ilLTIPlatform) {
+                $platform->setExtConsumerId(intval($row->ext_consumer_id));
+                $platform->setRefId((int) $row->ref_id);
+            }
             // if ($platform->setTitle) $platform->setTitle($row->title);
             // if ($platform->setDescription) $platform->setDescription($row->description);
             // if ($platform->setPrefix) $platform->setPrefix($row->prefix);
@@ -158,6 +163,7 @@ public function loadPlatform(Platform $platform): bool
             $this->fixPlatformSettings($platform, false);
             $ok = true;
         }
+
         return $ok;
     }
     #######
@@ -1573,7 +1579,7 @@ public function loadUserResult(User $userresult): bool
                 'WHERE user_pk = ' . $ilDB->quote($id, 'integer');
         } else {
             $rid = $userresult->getResourceLink()->getRecordId();
-            $uid = $userresult->getId(ToolProvider\Tool::ID_SCOPE_ID_ONLY);
+            $uid = $userresult->getId(IdScope::IdOnly);
 
             $query = 'SELECT user_pk, resource_link_pk, lti_user_id, lti_result_sourcedid, created, updated ' .
                 'FROM ' . $this->dbTableNamePrefix . DataConnector::USER_RESULT_TABLE_NAME . ' ' .
@@ -1619,7 +1625,7 @@ public function saveUserResult(User $userresult): bool
             $userresult->setRecordId($ilDB->nextId($this->dbTableNamePrefix . DataConnector::USER_RESULT_TABLE_NAME));
             $userresult->created = $time;
             $rid = $userresult->getResourceLink()->getRecordId();
-            $uid = $userresult->getId(ToolProvider\Tool::ID_SCOPE_ID_ONLY);
+            $uid = $userresult->getId(IdScope::IdOnly);
             $query = 'INSERT INTO ' . $this->dbTableNamePrefix . DataConnector::USER_RESULT_TABLE_NAME . ' ' .
                 '(user_pk,resource_link_pk,lti_user_id, lti_result_sourcedid, created, updated) ' .
                 'VALUES( ' .
diff --git a/components/ILIAS/LTIProvider/classes/class.ilLTIRouterGUI.php b/components/ILIAS/LTIProvider/classes/class.ilLTIRouterGUI.php
index e46e68d2ff90..75f42a485bae 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilLTIRouterGUI.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilLTIRouterGUI.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * Service ilViewRouterGUI
  * This service is used by LTI. It allows any plugin to get called by a http request without dependencies to a
diff --git a/components/ILIAS/LTIProvider/classes/class.ilLTIViewGUI.php b/components/ILIAS/LTIProvider/classes/class.ilLTIViewGUI.php
index 0a2ca889b860..0edd8a23f19c 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilLTIViewGUI.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilLTIViewGUI.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 use ILIAS\LTI\Screen\LtiViewLayoutProvider;
 
 /**
@@ -136,15 +136,30 @@ public function initGUI(): void
     {
         $this->log->debug("initGUI");
         $baseclass = '';
+        $cmdclass = '';
         if ($this->wrapper->query()->has('baseClass')) {
             $baseclass = strtolower($this->wrapper->query()->retrieve('baseClass', $this->kindlyTo->string()));
         }
         if ($this->wrapper->query()->has('cmdClass')) {
             $cmdclass = strtolower($this->wrapper->query()->retrieve('cmdClass', $this->kindlyTo->string()));
         }
+
         if ($baseclass == 'illtiroutergui') {
             return;
         }
+
+        $target = ilSession::get('lti_init_target');
+        if ($target) {
+            list($type, $ref_id) = explode('_', $target);
+
+            ilSession::clear('lti_init_target');
+
+            ilUtil::redirect(
+                "ilias.php?baseClass=ilRepositoryGUI&ref_id=" . $ref_id
+                . "&cmd=view"
+                . "&cmdClass=ilobj" . strtolower($type) . "gui"
+            );
+        }
     }
 
     /**
@@ -203,7 +218,7 @@ protected function getContextId(): ?int
                 }
             }
 
-            $referrer = (int) $this->effectiveRefId;
+            $referer = (int) $this->effectiveRefId;
 
             if ($referer > 0) {
                 if (ilSession::has('lti_' . $referer . '_post_data')) {
diff --git a/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministration.php b/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministration.php
index c6a484e5683c..614de5244e84 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministration.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministration.php
@@ -1,6 +1,5 @@
 <?php
 
-declare(strict_types=1);
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -17,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * Class ilObjLTIAdministration
  * @author Jesús López <lopez@leifos.com>
diff --git a/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministrationAccess.php b/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministrationAccess.php
index 22552b70c452..2000f5849c80 100644
--- a/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministrationAccess.php
+++ b/components/ILIAS/LTIProvider/classes/class.ilObjLTIAdministrationAccess.php
@@ -1,6 +1,5 @@
 <?php
 
-declare(strict_types=1);
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -17,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 /**
  * Class ilObjLTIAdministrationAccess
  *
diff --git a/components/ILIAS/LTIProvider/resources/lti.php b/components/ILIAS/LTIProvider/resources/lti.php
index d9301d1a3bcf..ac09b6111538 100644
--- a/components/ILIAS/LTIProvider/resources/lti.php
+++ b/components/ILIAS/LTIProvider/resources/lti.php
@@ -1,19 +1,34 @@
 <?php
 
-declare(strict_types=1);
-
 /**
- * LTI launch target script
+ * This file is part of ILIAS, a powerful learning management system
+ * published by ILIAS open source e-Learning e.V.
+ *
+ * ILIAS is licensed with the GPL-3.0,
+ * see https://www.gnu.org/licenses/gpl-3.0.en.html
+ * You should have received a copy of said license along with the
+ * source code, too.
  *
- * @author  Stefan Meyer <smeyer.ilias@gmx.de>
- */
+ * If this is not the case or you just want to try ILIAS, you'll find
+ * us at:
+ * https://www.ilias.de
+ * https://github.com/ILIAS-eLearning
+ *
+ *********************************************************************/
+
+declare(strict_types=1);
+
+require_once("../vendor/composer/vendor/autoload.php");
+
 ilContext::init(ilContext::CONTEXT_LTI_PROVIDER);
 
+// This is done to replace the deprecated method $DIC->ctrl()->setCmd
+$_GET['cmd'] = 'post';
+$_POST['cmd'] = 'doLTIAuthentication';
+
 ilInitialisation::initILIAS();
 
-// authentication is done here ->
 global $DIC;
-// @todo: removed deprecated ilCtrl methods, this needs inspection by a maintainer.
-// $DIC->ctrl()->setCmd('doLTIAuthentication');
+
 $DIC->ctrl()->setTargetScript('ilias.php');
 $DIC->ctrl()->callBaseClass('ilStartUpGUI');
diff --git a/components/ILIAS/LTIProvider/tests/bootstrap.php b/components/ILIAS/LTIProvider/tests/bootstrap.php
index 174d7fd709f4..8502d9fbcea2 100644
--- a/components/ILIAS/LTIProvider/tests/bootstrap.php
+++ b/components/ILIAS/LTIProvider/tests/bootstrap.php
@@ -1,3 +1,19 @@
 <?php
 
+/**
+ * This file is part of ILIAS, a powerful learning management system
+ * published by ILIAS open source e-Learning e.V.
+ *
+ * ILIAS is licensed with the GPL-3.0,
+ * see https://www.gnu.org/licenses/gpl-3.0.en.html
+ * You should have received a copy of said license along with the
+ * source code, too.
+ *
+ * If this is not the case or you just want to try ILIAS, you'll find
+ * us at:
+ * https://www.ilias.de
+ * https://github.com/ILIAS-eLearning
+ *
+ *********************************************************************/
+
 declare(strict_types=1);
diff --git a/components/ILIAS/LTIProvider/tests/ilLTIToolConsumerTest.php b/components/ILIAS/LTIProvider/tests/ilLTIToolConsumerTest.php
index d51235f5424b..23feb9b4fdd3 100644
--- a/components/ILIAS/LTIProvider/tests/ilLTIToolConsumerTest.php
+++ b/components/ILIAS/LTIProvider/tests/ilLTIToolConsumerTest.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -18,6 +16,8 @@
  *
  *********************************************************************/
 
+declare(strict_types=1);
+
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -28,8 +28,6 @@ class ilLTIToolConsumerTest extends TestCase
 {
     public function testTitle(): void
     {
-        $this->markTestSkipped('Test skipped while integrating the new dependencies in LTI components.');
-
         $ltiToolConsumer = new ilLTIPlatform(
             $this->createMock(ilLTIDataConnector::class)
         );