Need some clarification on implementing MS Teams channel with ODA

Summary:

We are in the process of integrating Oracle Digital Assistant with MS Team Channel. We reached out to MS Team for setup and team came back with some questions. Need clarification on the below points.

1. If the Bot App Registration can be changed to a single Tenant app registration instead of multi tenant.
2. Why Directory.Read.All API permission is required for the App registration.

Reference doc: https://docs.oracle.com/en/cloud/paas/digital-assistant/use-chatbot/microsoft-teams.html#GUID-7E688AA4-6C63-4F1E-99CB-06773BD0A878

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