Remote move Migration fails due to "matches multiple entries"

Dear Santos Sam,

Greetings!

Thanks for reaching out to this community.

Based on your description, I'm sorry to hear that you have issue with remote move migration and it fails due to "matches multiple entries".

According to "Multiple entries" error when a remote move migration fails - Exchange | Microsoft Learn, this possible cause for this error is that a soft-deleted or inactive mailbox has the same email address as the mailbox that's identified in the error message.

Resolution

Specify a mailbox by its GUID instead of its email address. When you specify a mailbox for migration by its GUID, you must use the New-MoveRequest PowerShell cmdlet. The following steps describe how you can get the GUID of an active mailbox and then migrate the mailbox by specifying its GUID:

1. Run the Get-Mailbox cmdlet for the mailbox that's identified in the error message:

Get-Mailbox -Identity <conflicting email address> | fl Name, Alias, DistinguishedName, GUID

This command doesn't return soft-deleted or inactive mailboxes.

2. Migrate the active mailbox by using the New-MoveRequest cmdlet and the GUID from step 1:

New-MoveRequest -Identity <active mailbox GUID>

More information

If you want to identify soft-deleted or inactive mailboxes by email address, you can run the following cmdlet:

Get-Mailbox -Identity <email address> -SoftDeletedMailbox -IncludeInactiveMailbox | fl Name, Alias, DistinguishedName, GUID, IsSoftDeletedByRemove, *Hold*

If the preceding search doesn't report any soft-deleted or inactive mailboxes, you can run the following cmdlet to check for other soft-deleted recipients:

Get-Recipient -Identity <email address> -IncludeSoftDeletedRecipients | fl Name, Alias, DistinguishedName, GUID

Note: A soft-deleted or inactive mailbox in the output of Get-Mailbox or Get-Recipient will have a distinguished name (DN) that includes the organizational unit (OU) key-value pair OU=Soft Deleted Objects. An inactive mailbox is a type of soft-deleted mailbox. Therefore, it has the same OU value. An example DN for a soft-deleted or inactive mailbox is as follows:

CN=dakota.sanchez,OU=Soft Deleted Objects,OU=contoso.onmicrosoft.com,OU=Microsoft Exchange Hosted Organizations,DC=EURPR07A005,DC=prod,DC=outlook,DC=com

Appreciate your patience and understanding and thank you for your time and cooperation. I wish you all the best!