appcenter Error: Could not add password to keychain: security: SecKeychainItemCreateFromContent (<default>): The user name or passphrase you entered is not correct. code example

Example: The user name or passphrase you entered is not correct.

we think this is related to Keychain access due to some sort of macOS update:

Try opening Keychain Access.app. Right-click on the login keychain and try locking it and then unlocking it again.