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To fix the Keychain issue on a TCNJ Mac, open Finder and go to "Applications" and open the "Self Service" program.
Under the "Settings" sections should see an icon of keys labeled “Fix Keychain issue”. Click on the “Run” button, read the information and click the blue “Run” button.
Once you restart the Mac the Keychain issue should be resolved. Your first login after the restart may be somewhat slow.