Office 365: Unable to locate an Azure Active Directory user for an Exchange Online Mailbox

In order for an Exchange Online mailbox to exist in Office 365 it must be attached to an Azure Active Directory object.  In Exchange Online we record the object ID for the Azure Active Directory account as the external directory object id of the mailbox. PS C:\> Get-Mailbox tmcmichael | fl name,externalDirectoryObjectID Name                      : Timothy…

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