diff --git a/lib/microsoft_graph/application_authenticator.rb b/lib/microsoft_graph/application_authenticator.rb
index f096e177b..78e2dc557 100644
--- a/lib/microsoft_graph/application_authenticator.rb
+++ b/lib/microsoft_graph/application_authenticator.rb
@@ -31,7 +31,7 @@ def get_access_token
 
         @access_token
       else
-        raise AuthenticationFailureError, json["error"]
+        raise AuthenticationFailureError, [json["error"], json["error_description"]].compact.join(": ")
       end
     end