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ODM Accounts: The Azure AD user should be migrated or matched first before migrating mail
Description
Attempting to Match Accounts in the On-Demand Migration (ODM) UI screen fails with the error "The Azure AD user should be migrated or matched first before migrating mail".
Cause
The mailbox user account likely has the same values of attributes (such as email address etc.) on the source and the target. This can happen when the source domain is the same as the target domain. Such as firstname.lastname@OurCompanyA and firstname.lastname@OurCompanyA on both tenants.
The tool isn't expecting that and is throwing a misleading error message.
Resolution
Match by a csv file using the objectId. The user accounts will still have different object ids and not trigger the error. The match will be successful and then you can move on to migrating mail.
Your Request will be reviewed by our technical reviewer team and, if approved, will be added as a Topic in our Knowledgebase.
Recommended Content
Product(s):
On Demand Migration
Current
Topic(s):
Troubleshooting
Article History:
Created on: 3/12/2022 Last Update on: 4/30/2026
Thank you for your feedback for Topic Request
Your Request will be reviewed by our technical reviewer team and, if approved, will be added as a Topic in our Knowledgebase.
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