Please see Microsoft's support article: https://support.office.com/en-us/article/create-and-use-private-channels-16cc2bc9-a468-4469-9d6c-63da5c2a390c
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Please see Microsoft's support article: https://support.office.com/en-us/article/create-and-use-private-channels-16cc2bc9-a468-4469-9d6c-63da5c2a390c