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A library to interact with Azure Active Directory to get informations about users, to add them to a group, remove..
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- to add or remove devices such as phones (this step was made for a higher degree of security when using services offer by a particular company)
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All the above steps you can do straightforward with PowerShell scripts, there is a wrapper that allows you to use PowerShell over C#
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The problem with this is that if you want to deploy this on Azure, you can't because the modules for using PowerShell via visual studio can't be installed on Azure container