AD Graph (graph.windows.net) allows to redeem invitations programmatically without user intervention by calling `/redeemInvitation` as described in https://github.com/projectKudu/ARMClient/wiki/AAD-Invite-User-Apis.
The current APIs in MS Graph (graph.microsoft.com) don't seem to support this scenario.
They only support involving the user approval, either by an email or by a custom invitation redemption link.
This makes it impossible to migrate an app to Graph API that was relying on this mechanism for seamless user invitation to a tenant.
