MISSING USER ACCOUNT IN GLOBAL ADDRESS LIST (GAL)

The user account may configured correctly on the Exchange and AD, based on my troubleshooting.  I just remove the Global Address List (GAL) attribute on the ADSIEDIT and re-add again into the GAL.  After that the problem resolved with the user appeared on the GAL.

Steps 1: Go to CMD and run ADSIEDIT.MSC.

Steps 2: On the ADSIEDIT console, expand the Domain > DC > and select CN=Users

         

Steps 3: On the right pane, Select the problematic user, right click and choose Properties.

Steps 4: On the user Properties, search and edit the ShowInAddressBook attribute.

Steps 5: Select the CN=Default Global Address List,CN=All Global Address Lists,CN=Address Lists Container,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=tez,DC=net copy and paste to notepad.

Steps 6: After that click Remove and click OK twice.

Steps 7: Right click and select Properties on the same user and edit the ShowInAddressBook attribute.

Steps 8: Enter the CN=Default Global Address List,CN=All Global Address Lists,CN=Address Lists Container,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=tez,DC=net click Add and OK twice.

Steps 9: Update the GAL on exchange server with run the Exchange PowerShell command as below;
Update-GlobalAddressList -identity "Default Global Address List" -DomainController "Domain_Controller_PDC_Name" and enter the command to update GAL.

Steps 10: Manually download the GAL on the MS Outlook and the problem resolved.