If you can’t login using the Lastpass CLI tool and it just says “unknown” when you enter your password, there’s a simple fix. Go to My Vault -> Account Settings. In there, press “Show Advanced Settings”. Then set “Password Iterations” to 100100 and follow the procedure. After that, the CLI tool will work again! Lastpass CLI can't login using master password was originally published by Martin Paul Eve at Martin Paul Eve on July 28, 2022.