Exchange Online: An unknown error has occurred. Refer to correlation ID: bcaed709-6a5f-498f-8ff4-634ea1d4e375

Error : Exchange: An unknown error has occurred. Refer to correlation ID: bcaed709-6a5f-498f-8ff4-634ea1d4e375

To get more details about this error start Powershell and enter this commands :

connect-msolservice

Get-MsolUser-HasErrorsOnly|flDisplayName,UserPrincipalName,@{Name=”Error”;Expression={($_.errors[0].ErrorDetail.objecterrors.errorrecord.ErrorDescription)}}

 {The value “856e3acb-ab9a-45ea-93fd-1376af76c2a1” of property “ExchangeGuid” is used by another recipient object. Please specify a unique value., The value “856e3acb-ab9a-45ea-93fd-1376af76c2a1” of property “ExchangeGuid” is used by another recipient object. Please specify a unique value.} 

https://support.microsoft.com/en-us/topic/you-see-validation-errors-for-users-in-the-office-365-portal-or-in-the-azure-active-directory-module-for-windows-powershell-5c3bf8f7-de1b-6f51-6623-3c005d1f5900

I resolved this issue by

  • placing the User account in an OU that is not synced to the Office 365.
  • Force replication and AAD sync
  • Disable the mailbox On-Premises with the disable-remotemailbox command <ExchangeGuid>
  • Place the account back to the origin OU
  • Force replication and AAD sync

At this moment the user account has a nemly created empty mailbox.

At this point we are going to use the New_MailboxRequest cmdlet to restore the (soft deleted) original mailbox to the newly created mailbox.

#To find the ExchangeGuid of the origin soft deleted mailbox :

Get-Mailbox -SoftDeletedMailbox <identity>| Fl Name,ExchangeGuid

#To find the ExchangeGuid of the newly created mailbox :

Get-Mailbox -Identity <identity>  Select-Object UserPrincipalName,Name,ExchangeGuid

#Start the Mailbox restore

New-MailboxRestoreRequest -SourceMailbox “<ExchangeGuid softdeleted mailbox” -TargetMailbox “ExchangeGuid new mailbox” -AllowLegacyDNMismatch

#Folluw up

Get-MailboxRestoreRequest

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