You have changed your SU NetID password
When you try to print to the printers, the job doesn't print and you receive a message Hold for Authentication or On Hold (Authentication Required).
Open you Mac's Keychain Access application. There are two ways to do this:
You should see an entry similar to the one below with the same name that you have the printer saved as.
Highlight the entry in the list and then hit the delete key on your keyboard.
Select Delete when prompted.
Now try to print your print job again
You will be prompted to enter your credentials. Make sure that both the option for Registered User and Remember this password in my keychain are selected.