Use guest access and external access to collaborate with people …
https://learn.microsoft.com/en-us/microsoftteams/communicate-with-users-from-other-organizations
WebJan 12, 2024 · Guest access. Use guest access to add a person from outside your organization to a team, where they can chat, call, meet, and collaborate on files. A guest can be given nearly all the same Teams capabilities as a native team member. For more information, see Guest experience in Teams.
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