Newly created users not available for migration to Exchange online despite successful AD Sync

Question

We have an issue with newly created users. They are created in AD and Exchange. The sync runs fine and the users appear in Entra. When we go to EOL admin center and then to Migration, start a new migration batch but the users mailboxes aren't available.

Sometimes they show up after an hour or two, sometimes they never show up at all. This has only just started happening.

Answer 1

Hi, @Adrian Foster

Welcome to the Microsoft Q&A platform!

Based on your description, I understand that even though the AD sync is successful, the newly created users are still unavailable at the time of migration.

Can you provide more information so I can troubleshoot?

First of all, what exactly do you mean when you say that the user's mailbox is unavailable? Can't find the user's mailbox? If an error is reported, could you provide a screenshot of the error?

In addition, you can try the following suggestions:

1.Can you find these mailboxes in the EAC? Or you can use Get-Recipient to view the status of these mailboxes.

2.Is the email function enabled in the mailbox? Make sure you have access to the email feature.

3.Make sure that the mailbox is assigned a license.

4.Enable Enable-Remotemailbox on the AD user and verify the synchronization of Azure.

More information can be found On provisioning mailboxes in Exchange Online when in Hybrid - Microsoft Community Hub

5.The directory synchronization tool synchronizes objects at regular intervals. It means that newly created users will not be synced online until the next directory sync.

6.In a hybrid environment, synchronization issues between on-premises AD and Exchange Online can lead to inconsistencies in mailbox information, which in turn can affect migrations.

You can manually use Start-ADSyncSyncCycle -PolicyType Delta to force synchronization to ensure that changes in on-premises AD are immediately reflected in Exchange Online.

7.You can also add tags for Active Directory to troubleshoot AD synchronization.

If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.

Answer 2

I am facing the same problem.

• Entra ID Sync is running without error
• the user exists in Azure AD
• the user has assigned a license
• the user exists on the onprem exchange and has an onprem mailbox
• mailing is working with the onprem mailbox
• when i want to create a migration batch and want to specify the user, the name is not resolved (see attached picture)
• if I try submitting the user in a csv I can create and start the batch but it ends up with error "MigrationRecipientNotFoundException: A recipient wasn't found for "test.test@xxx.ch" on the target. Create a recipient of the appropriate type for this migration on the target and try again.

Users which already had been synced in the past are resolvable and selectable when I create a migration batch.

Answer 3

Yes, we also facing the same issue.