Azure AD B2B: How to bulk add guest users without invitation redemption.

I think most of you are familiar with the concept of Azure AD Business-to-Business (B2B) where you can add users of other companies to your Azure AD tenant. This feature does not require the partner organization to already own or manage their own tenant; you can simply invite every user with an email address.

If the invited user already exists in an Azure AD tenant a guest user is created in your tenant that is linked to this user object in the foreign tenant.

If the invited user does not exists in an Azure AD tenant a shadow/unmanaged tenant is created behind the scenes for that user, additional users from the same domain will then created within this unmanaged tenant.

However, if you add a foreign user to your tenant an invitation mail is send to this user you add and the user has to redeem the invitation. By default, users are created as a guest user, which don’t have any permission (even read directory) in your tenant. Nevertheless, you can assign permissions like application permission, Azure AD or RBAC roles to such users.
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