Unfortunately as far as I’m aware, there aren’t any functions that allow players to join groups in game. All game functionality related to groups are info retrieving functions and read-only properties. This has been a widely requested feature since groups were first implemented. I believe at one point it was almost in the process of being supported but I don’t think the JoinGroup feature’s development concluded. This was way back in the ancient days of Roblox, the JoinGroup feature request has probably been long forgotten at this point.
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