I keep getting these from some of my squad ... I'm sure its over, but perhaps they can't go on due to being stuck @ the advent calendar: "XXX is requesting help for their Advent Calendar. Help Now" AND of course u can't help them Is this because they can only help themselves now or what???
This is a bug that will be fixed in the next couple of hours. Your squad members are not stuck however as new keys still regenerate daily so they will be able to complete the calendar.
