Cross Tenant Migration Error - GUID

Question

I am getting an error during the migration.

The user object for 'xxxxx' does not have a valid ExchangeGuid property and cannot be migrated.

Answer 1

Hi @Auon Ali Khowaja ，

Cross-tenant migration requires that the mail user in the target tenant has the same user mailbox as the source tenant . You can follow these steps to set the mail user's ExchangeGuid:

1.Connect to the Exchange online PowerShell of the source tenant and refer to the following command to get the ExchangeGuid of the specified user mailbox:

 get-mailbox userone |fl *guid

2.Copy the ExchangeGuid as a backup

3.Connect to the Exchange online PowerShell of the target tenant and refer to the following command to set the ExchangeGuid of the specified mail user:

set-mailuser userone -ExchangeGuid 89bd6765-xxx-40xxx-a21a-1ccxxx92187

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Answer 2

From the Exchange Online session, use the following command to manually set the GUID to match the on-prem one.

Set-MailUser -Identity user@domain.com -ExchangeGUID xxxxxxxxx-xxxxxxxxxxxxxxxxxxxx

Once this command completes, you can use the Get-MailUser command again to check if the changes have been written to Azure AD.

Answer 3

What is the reason for this