A mailbox operation couldn't be performed because multiple matched entries. (4371150)

A mailbox operation couldn't be performed because multiple matched entries.

User mailboxes are generating error when adding to mailbox job queue. Error states:

Update Running Jobs
Get-MoveRequestStatistics failed.
Get-MoveRequest -ErrorAction "SilentlyContinue" | Get-MoveRequestStatistics
The operation couldn't be performed because 'user1' matches multiple entries.
The operation couldn't be performed because 'user2' matches multiple entries.
The operation couldn't be performed because 'user3' matches multiple entries.
 

The remote move migration fails because a soft-deleted or inactive mailbox has the same email address as the mailbox that's identified in the error message.

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