account_nonunique— This error occurs after a user selects “Login help” and enters personal details that match multiple account records stored by the payroll system’s account recovery service.mfa_cancelled_by_the_user— This error occurs when a user exits Link’s multi-factor authentication (MFA) screen during an account connection attempt before completing the MFA process.platform_temporarily_unavailable— This error occurs when an account is connected to a payroll system that is experiencing temporary connection issues.