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