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Create a verified list of the resource mailboxes Planner must be able to access.
The original guide uses a mail-enabled security group and Application Access Policy. Microsoft now recommends planning new setups with Application RBAC; use the documentation below.
Clarify app registration and permissions with IT and MyDesk, and configure the agreed demarcation.
Test access to both an allowed and an excluded room. Consider Microsoft's replication time before evaluating the result.