The “Keychain” on your Mac is where your computer saves passwords and other private information. Staff may find that their computer requests access to a "keychain" but won’t accept their normal MPS password, especially after they’ve recently updated the password. If you’re having problems with the Keychain on your Mac, you may want to clear the Keychain’s stored information and start fresh—without all of those pesky popup windows.
Learn how to fix Keychain Problems on your Mac.