diff --git a/src/Module/OAuth/Authorize.php b/src/Module/OAuth/Authorize.php
index 266f00402e..cd7b274ba6 100644
--- a/src/Module/OAuth/Authorize.php
+++ b/src/Module/OAuth/Authorize.php
@@ -36,17 +36,18 @@ class Authorize extends BaseApi
 		], $request);
 
 		if ($request['response_type'] != 'code') {
-			Logger::warning('Unsupported or missing response type', ['request' => $_REQUEST]);
+			Logger::warning('Unsupported or missing response type', ['request' => $request]);
 			$this->logAndJsonError(422, $this->errorFactory->UnprocessableEntity($this->t('Unsupported or missing response type')));
 		}
 
 		if (empty($request['client_id']) || empty($request['redirect_uri'])) {
-			Logger::warning('Incomplete request data', ['request' => $_REQUEST]);
+			Logger::warning('Incomplete request data', ['request' => $request]);
 			$this->logAndJsonError(422, $this->errorFactory->UnprocessableEntity($this->t('Incomplete request data')));
 		}
 
 		$application = OAuth::getApplication($request['client_id'], $request['client_secret'], $request['redirect_uri']);
 		if (empty($application)) {
+			Logger::warning('An application could not be fetched.', ['request' => $request]);
 			$this->logAndJsonError(422, $this->errorFactory->UnprocessableEntity());
 		}
 
diff --git a/src/Security/OAuth.php b/src/Security/OAuth.php
index a24bb0e8d0..2add1ce584 100644
--- a/src/Security/OAuth.php
+++ b/src/Security/OAuth.php
@@ -131,6 +131,7 @@ class OAuth
 
 		// The redirect_uri could contain several URI that are separated by spaces.
 		if (($application['redirect_uri'] != $redirect_uri) && !in_array($redirect_uri, explode(' ', $application['redirect_uri']))) {
+			Logger::warning('Redirection uri does not match', ['redirect_uri' => $redirect_uri, 'application-redirect_uri' => $application['redirect_uri']]);
 			return [];
 		}