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Run the below command against each mailbox to see the value for IsExcludedFromProvisioning

  • Get-MailboxDatabase -Server <ServerName>| select Name,ServerName,IsExcludedFromProvisioning

By default, all the database have False value on in the IsExcludedFromProvisioning

The databases you want excluded from automatic provisioning of new mailboxes; set the value of IsExcludedProvisioning to $true

  • Set-MailboxDatabase "Database Name" -IsExcludedFromProvisioning $true