The operation couldn't be performed because 'USER' matches multiple entries

I’m trying to apply some settings to a mailbox via PowerShell but I’m getting this error back. There are actually two users with the same name in the domain, but I cannot delete them. I wonder if there is any way to force this change?

This is command:

$Credentials = Get-Credential
Connect-ExchangeOnline -UserPrincipalName USER
$SignatureSocial = Get-Content C:\Users\joao.victor\Desktop\assinatura.txt
Get-User -Identity “USER” | Set-MailboxMessageConfiguration -SignatureHTML $SignatureSocial -AutoAddSignature:$true

Use a unique identifer for the user, such as the DistinguishedName (DN).

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