The below video highlights how you can download two very helpful lists. The first is the Active user's list, which can show you who has logged into their accounts either online or via the app. And the second is the Inactive user's list which shows those users who have yet to log in to the app and their temporary passwords.
Remember that all posts now go out as text messages containing a link to a secure page for parents to view/interact with them. This means that there will be parents that are receiving and viewing messages but may never technically log into their apps.