The OUtlook client wont see in the Offline Address Book until its downloaded which can take up to 24 hours.
You can try manually updating:
Send/Receive-> Send/Receive Groups-> Download Address Book
https://www.howto-outlook.com/howto/oabupdate.htm
Check outlook web app now and it should be there
Also you should be able to view with the "All Users" menu in Outlook