The Group you were part of may have been disbanded. Don't worry! Check to see if you're still part of the group by checking the top left to see if there are other profiles from your team. Or, press the Social menu and create a new Group to invite your friends, or enter the Group Code if you still have it. You can also ask them to invite you again.
I played with friends in a Group and don't see them on the Island anymore.
Last Updated: 346d