Office 365 Migrated Mailbox not showing in Address Book \ GAL for On-premises Users

Issue:

Office 365 Migrated Mailbox not showing in Address Book \ GAL for On-premises Users

Symptoms:

-Unable to find users in GAL \ Address Book
-Emails sent failing with NDR (Non Delivery Report)

Solution:

-Go to Run -> ADSIEdit.msc

-Expand Default Naming Context

-Navigate to the OU in which the problematical user mailbox is located

-Verify the attribute ShowInAddressBook

-If this value is Not Set, compare this attribute with a working user and update the attribute ShowInAddressBook

-Update the GAL if required by using the below command,

Get-GlobalAddressList | Update-GlobalAddressList

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