Created a private group, then got a few of my friends on it, and now none of us can figure out how to get them into the clan from the private group. The option that from what I gather to join that is supposed to be at the top after you choose your platform, well it just isn't there for anyone. Clan is enabled, so says the group at least, and I've been at this for longer than I'd like to admit.
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The founder will need to enable clans from the admin tools.