To fix the Keychain issue on a TCNJ Mac, open Finder and go to "Applications" and open the "Self Service" program.
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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.
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Once you restart the Mac the Keychain issue should be resolved. Your first login after the restart may be somewhat slow.