Advanced Sessions Plugin

I am trying to create lobby and invite friends into to it. I am successful in creating and inviting people also. But I could not make onSessionInviteReceived called on the invitee client.
I have the same AdvancedFriendsGameInstance as my Project Game Instance. But when I accept Invite using Steam “chat box” of the particular invite client. I could see “onSessionInviteAccepted” is called on the invitee client.

Can you please help sorting this ? Am I missing anything here ?