You can add them as guest in teams. For more details about how to add guests, you can refer to the following two articles:
- https://video2.skills-academy.com/en-us/microsoftteams/add-guests
- https://support.microsoft.com/en-us/office/add-guests-to-a-team-in-teams-fccb4fa6-f864-4508-bdde-256e7384a14f
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