Getting older message of thread

Hi All,
I am facing an issue while joining an older conversation(thread).
Issue is:
3 user’s are chatting(private chat) from 30 minutes then after they invited another member to join the conversions, we don’t want 4th person to see last 30 minutes conversation, but he is receiving the last 30 minutes message through xmpp, but we don’t want 4th person to receive last 3o minutes messages.
When i received the invitation then i am joining the thread and sending the history stanza with current time. (sence=‘currentdate’), But still receiving the messages. What should i do to handle this scenario?


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