Thanks for the update! I suppose Global Reader is an improvement. Hopefully they will add a more appropriate role (or proper service principal permissions) in the future. (Or even better: a new API for Reporting/MessageTrace!)
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@jconger Have you definitively confirmed with Microsoft that the Exchange Administrator role is 100% required for this? Exchange Administrator is a fairly highly privileged role, and it seems absurd to be casually handing out such a role to an app registration that is only used to fetch Message Trace report.
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