Important: You must be a team owner to add a guest. To add or change owners, see Make someone a team owner.
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On the left, select Teams, select the ellipsis (...) next to the team, and then select Add member.
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Enter the guest's email address and press Enter.
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Select Add.
If you see the message "We didn't find any matches," contact your administrator to Turn guest access in Microsoft Teams on or off.