Restore an Office 365 mailbox

We use AD Connect when creating users in our on-prem Active Directory.  The account will then be synced to Office 365 and create user there as well as their mailbox.  

We have recently removed a user account and mailbox and want to restore.  I recreated her AD account and sync.  When I go to Office 365->deleted users and try to restore, it is saying there is a conflict.

What is the proper way to restore?

Please advise.
nav2567Asked:
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Vasil Michev (MVP)Commented:
The correct way would be to recover the account from the AD Recycle bin, not create a new one - this generates a new object, with new objectID, and thus it will not match against the object you have in O365. You can also recover the mailbox directly, as detailed here: https://technet.microsoft.com/en-us/library/dn186233(v=exchg.150).aspx
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Ajit SinghCommented:
How to troubleshoot deleted user accounts in Office 365, Azure, and Intune:
https://support.microsoft.com/en-us/help/2619308/how-to-troubleshoot-deleted-user-accounts-in-office-365--azure--and-in

Delete or restore user mailboxes in Exchange Online:
https://technet.microsoft.com/en-in/library/dn186233(v=exchg.150).aspx

How to recover deleted mailbox items in Office 365:
https://enterpriseit.co/office365/recover-deleted-mailbox-items/

Hope this helps!
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Ajit SinghCommented:
Please post back if you need further assistance.
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