How to create a clan/tribe system

Hello, I am looking for some information on how to set up a clan or tribe system to add to my game. something like what ark has. I already have a multiplayer function added and think it would be beneficial to also have a system that allows players to join other groups.
Thank you for the help
Nathan.

What options have you considered so far?

I have created a claim sign function but don’t like how another player could join without being asked. I could add a pin to the sign so the players would have to know the password.