You can immediately join a public team. To join a private team, you must request to join and wait for the owner's approval.
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On the left, select Teams.
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Select Create and join teams and channels at the top of the teams list and choose Join team.
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Pick from the list, or type a team name into Search teams and press Enter.
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Hover over the team you want to join and select Join team.
To join using a Team code, see Join a team with a code.