Create a code
When you send someone a code to join a team, they can join directly—you won’t receive a join request. You can use the code as many times as you want.
If you’re a team owner, go to the team name and choose More options >Manage team.
Select the Settings tab and then Team code > Generate.
Select Copy. Share the code with your invitees however you choose—send the code to a single person through a chat or write it on a whiteboard in a room full of people.
People can use the code on the Suggested teams screen.
Note: Currently, guests can't join a team by using a code.