Powershell – Unable to create email alias because it already exists, but cannot find the instance of it

aliasemailmicrosoft-officemicrosoft-office-365powershell

Error:

An Azure Active Directory call was made to keep object in sync between
Azure Active Directory and Exchange Online. However, it failed.
Detailed error message: Another object with the same value for
property EmailAddresses already exists. The issue may be transient and
please retry a couple of minutes later. If issue persists, please see
exception members for more information.

Issue:

I'm trying to add an email alias to a user:

User: joe@email.com

Alias: joe@newemail.com

However, whenever I try to add this alias, it reports that the address exists, and I'm not sure why.

I checked with Powershell with this command:

Get-Mailbox -Identity * | Where-Object {$_.EmailAddresses -like 'smtp:joe@newemail.com'} | Format-List Identity, EmailAddresses

But it doesn't find anything … I have no idea where this address is to remove it, so I can add it to the users mailbox.

[Edit]

I should have mentioned as well, that when you try to send an email to joe@newemail.com it bounces back saying that it does not exists.

Best Answer

It may not be a mailbox, it may be a contact or distribution group. Try this:

Get-Recipient | Select DisplayName, RecipientType, EmailAddresses | Export-CSV c:\temp\recpients.csv

Then review the csv file and do a search for the alias to find the object with the alias.

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