diff --git a/lib/auth/m2m.js b/lib/auth/m2m.js
index 843770d..03d2e8d 100644
--- a/lib/auth/m2m.js
+++ b/lib/auth/m2m.js
@@ -72,7 +72,7 @@ module.exports = function (config) {
                 ' AUTH0_CLIENT_SECRET, AUTH0_AUDIENCE, AUTH0_PROXY_SERVER_URL')
                 )
               } else {
-                reject(new Error('Unknown Error'))
+                reject(new Error(body))
               }
             })
         }