on-prem Exchange 2016 migration to Exchange Online

Daniel 81 Reputation points


I have setup a hybrid connection between our Exchange 2016 and Exchange Online.

I have run in small issue when I try to move a mailbox from my on-prem Exchange to Exchange Online.

When I want to create a migration batch for a test user I'm not able to see the list of users. The entire list is empty.

Has anyone came across this issue?

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Microsoft Exchange Online
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Bruce Jing-MSFT 1,230 Reputation points Microsoft Vendor


    Glad to know that the issue has already been resolved and thanks for sharing the solution so that others experiencing the same thing can easily reference this! The reason I keep asking if you can see the synchronized users on the M365 portal is to determine if the issue is a sync to Azure AD or a sync to Exchange Online issue.

    Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer : )   


    Issue Symptom:

     In a hybrid deployment environment, when migrating users, the user list is found to be empty.



    There is a custom rule in AAD connect which set msExchMailboxGuid to NULL for all synced users. After removing this rule everything works as it should.

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