Hi Danny,
Based on my research, Fields in GAL such as Location, Department, Company and so on can be populated either by the properties of user in Active Directory users and computers and via the Exchange Management Console. There is not much we can do on
Outlook client side.
Since this forum is for general questions and feedback related to Office client, if you need further assistance on this issue, I'd recommend you post a new question in the following forum:
https://social.technet.microsoft.com/Forums/msonline/en-US/home?forum=onlineservicesexchange
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn
from your interaction with us. Thank you for your understanding.
Steve Fan
TechNet Community Support