Office 365 (Skype for Business) - Adding Groups to your Contact List
Distribution groups can be used as contacts in Skype for Business to allow communication either with an entire group or to identify and communicate with individuals within a group.
When you first log in to Skype for Business, you may not have any groups or contacts established.
To add groups or individuals, insert the name (or part of the name) in the field that says "Find someone" at the top of the box just under the avatar. You can add distribution groups (a group of mail recipients that is addressed as a single recipient) or individuals. When you start to type in the box, you will begin to see suggestions. This information is pulling from the Global Address List (GAL or Shared Address Book).
Once you locate the group you wish to add, right click on the name and select Add to Contacts List.
To verify that you are selecting the correct distribution group, you can choose See Contact Card. This will allow you to see the members of the list.
Once you select Add to Contacts List, the groups that you have added will be displayed.
To view all the members of a group, click the arrow to the left of the name to expand the group.