New-ManagementRoleAssignment –Role “Mailbox Import Export” –User “domainuser”
Replace domainuser with your domain and user account, that should finish up nicely and now you can…wait I still can’t run the command? Permissions are loaded when the shell starts so you now have to exit the PowerShell window and re-lauch. Now you can run the New-MailboxImportRequest command
Now, when you run the command you will see that it is “Queued”
To see the status of the import run Get-MailboxImportRequestStatistics -Identity MailboxMailboxImportName where ‘mailbox’ is the user account from the image above and ‘MailboxImportName’ is the name above. So for example my command looked like