This is something that has come up frequently at RVE and I just figured it out today. When teachers go to print the job sits in the queue with an error Holding for Authentication. If you click on the refresh button it will prompt for network credentials.
When the screen comes up for network credential the user has selected “remember this password in my keychain”. The issue is their network password has recently been changed and this is holding their old password. If they enter their new password here the print job will go through.