If they are part of the group and they've selected which clan they want then there is nothing to be done by anyone.
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I have the same problem as the original poster. My clan members are awaiting approval into the clan and there is no way to approve them. I've already accepted them into the group, what gives?
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I'm having a very similar problem. On the website (not the app) it says he has joined. But i can't accept him to the clan.