It’s easy to make group video calls on Xbox One using Skype. Before you make a group video call, your Kinect sensor must be plugged in. At least one person on the call must have a Premium Skype account. You can initiate a group video call with a maximum of 4 people in a group (including yourself). However, if someone else on Skype initiates the call from another device such as a Windows 8 PC, that call can include up to 25 people.
How to make group video calls
Use your controller to make a Skype group video call.
Sign in to your Xbox One console using your Microsoft account.
Select the Skype tile.
Select the phone icon.
Enter a phone number or select View all contacts to select the person you want to call.
Add up to 2 additional participants by using the Add participants button.