The use of Auto-Assign can lead to error AHD05454: Request NNN Assigned Assignee="" and Group="Group Name".
Strictly speaking, this is an informational message rather than an error. Starting with cumulative patch #2, a new variable NX_AUTOASG_GROUP_ONLY was introduced. When set to 1, this causes auto-assign to assign tickets to groups rather than individual analysts. To revert the behavior back so that tickets are assigned to individual analysts, edit the NX.env file in $NX_ROOT, and change NX_AUTOASG_GROUP_ONLY from 1 to 0, then recycle services.