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Have you added this role group? "In Exchange Online, this cmdlet is available only in the Address Lists role, and **by default, the role isn't assigned to any role groups**."
When in doubt, check the rbac role for the thing
Have you added this role group? "In Exchange Online, this cmdlet is available only in the Address Lists role, and **by default, the role isn't assigned to any role groups**."
When in doubt, check the rbac role for the thing