For the majority of the time the behaviour in Teams seems to be that the display name attribute is used? We use lastname first initial for the display name, for example Bloggs J. For some reason Teams has switched it's behaviour in Assignments, it now displays the staff members full name when posting assignments? Anyone else encountered this, do you know which AD attribute Teams is using in this instance? Annoying, as staff don't want their first names shown the students and there seems no logical/simple way to prevent it?