Subscription Issue

First post here… I had been using openfire 3.6.4 and spark 2.5.8 for about couple months now, so far so good… one issue came up, I installed the subscription plugin and set as “Reject All” so no users can manually add to their roster list, they can only see whoever in their groups. I created a test user and added to the subscription “white list” so I can test out the manually adding user feature, but when I want to add a user using spark (login as test user account), the new added user name pop up for a second then disappear. I had restart both openfire and spark, any idea?