Is there an option somewhere that I'm missing? I need 2 or 3 people so I can have the clan tag appear in game.
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You can only invite players to your group, but to join the group's clan is something they must do on their own. To invite someone to your group, you must navigate to their profile page on the website and hit "Interact" > "Invite to Group." Once they join, they must navigate to the group's homepage and hit "Set as (Console) Clan" to join the group's clan.