If a team owner has hidden a team, you won't be able to find it using search. Contact the owner to join the team.
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In the combined view, select Chat or Teams in the left pane, select More list options (
) at the top of the Chat or Teams pane, and choose  Your teams and channels. -
Select the down arrow byÂ
 Create team  at the top of the Your teams list and choose Join team. -
Choose a team from the gallery or type a team name in the upper left Search teams box and press Enter.