diff --git a/lib/Authsignal/AuthsignalClient.php b/lib/Authsignal/AuthsignalClient.php
index b46903c..4646cb0 100644
--- a/lib/Authsignal/AuthsignalClient.php
+++ b/lib/Authsignal/AuthsignalClient.php
@@ -16,7 +16,7 @@ public static function apiUrl($url='')
   public function handleApiError($response, $status)
   {
     $type = $response['error'] ?? null;
-    $msg  = $response['message'];
+    $msg  = $response['errorDescription'] ?? null;
     switch ($status) {
       case 400:
         throw new AuthsignalBadRequest($msg, $type, $status);