MyBB Community Forums

Hello, I'm looking plugins which make add particular users in the topic. On example I have which one topic and I want to invite 30 users who only can write in it.

Now I have a plugin Invite Only Threads, but after a few posts disappear IDs, and I must add this ID again.

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not more easy create folder that only one group has permission of write?
you only need invite 30 users to this group.