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Christian HansFlag for United States of America

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Office 365: Assign licenses before mailbox migration?

We have some users that were trying to migrate to Office 365, Exchange online...

They were given E3 licences weeks ago for testing the Msol services, but now we are unable to migrate their mailboxes successfully to the cloud. Would this possibly be because they were already enabled for Exchange Online and so a mailbox was provisioned in the cloud, prior to migrating their on-prem mailboxes?

How do we fix this? Remove the O365 E3 licenses, wait, migrate the mailbox and assign the license again?

Whats the general rule of thumb? Migrate mailboxes THEN assign licenses?

Thanks,
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Shreedhar Ette
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Hi Christian,

Which migration approach you are using?
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Vasil Michev (MVP)
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Thanks guys, in trying to fix this, the team also tried the following,

Remove-MsolUser -UserPrincipalName Frank@contoso.com
Remove-MsolUser -UserPrincipalName Frank@copntoso.com -RemoveFromRecycleBin

So the mailbox and user are out of Msol, waiting for a ADConnect to complete... but the mailbox in Exchange on-prem still shows as a remote mailbox.