We have a team of 16 that have access to the same board, we have created a new "column" in that board called "Assigned", any time we assign someone to a card we have automation set up to move the card to that "Assigned" column. An issue that we deal with though is that when a team member reviews their "Assigned to me" folder it is already marked as read. This occurs due to the item on the board being read for everyone on the board. I understand why it needs to show as read on the board so everyone know it has been addressed, but it would be nice to have automation set up so that we can use it in our assignment automation to mark as unread again.
