on-prem Exchange 2016 migration to Exchange Online

Daniel 81 Reputation points
2024-04-18T09:57:33.2166667+00:00

Hello,

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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Accepted answer
  1. Bruce Jing-MSFT 1,230 Reputation points Microsoft Vendor
    2024-04-24T09:24:27.1933333+00:00

    Hi,

    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.

     

    Resolution: 

    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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