Hi Claud,
I noticed that the syntax was incorrect above, it should read:
"Get-Recipient -Filter "ExchangeGuid -eq 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'"
This command will return the "MailUser" in O365 for which we do have the error message in the Portal but no other objects.
Just to make sure I've also tried the following:
$allRecipients = Get-Recipient -ResultSize Unlimited
$allRecipients | ?{$_.ExchangeGuid -match 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'}
The error message shows in the Office 365 Portal under "users and groups". We're not going to try and move the mailbox while there's a conflict with the ExchangeGuid for this account. There are no conflicts for the ExchangeGuid in the OnPrem environment.
Regards
/Dan