Can a player be on more than one team?

We already have an answer for a similar question which you can see here:
Can I belong to more than one cafe club at the same time?

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One game account can only belong to one club. A player must leave their club, before they will even get a button to join another. Note that some players have more than one game account. Also note there are many players with same names, especially if the names were produced by the game. The developers have a finite list of names that they repeat when naming players.