Common Auth0 Library Authentication Errors
The actions or input data of your users, during the sign up or the log in processes, might trigger errors. Here is a list of the most common errors that you might get if you use any of the Auth0 libraries for authentication.
Sign up
In the case of a failed signup, the most common errors are:
| Error | Description |
|---|---|
| invalid_password | If the password used doesn't comply with the password policy for the connection |
| invalid_signup | The user you are attempting to sign up is invalid |
| password_dictionary_error | The chosen password is too common |
| password_no_user_info_error | The chosen password is based on user information |
| password_strength_error | The chosen password is too weak |
| unauthorized | If you cannot sign up for this application. May have to do with the violation of a specific rule |
| user_exists | The user you are attempting to sign up has already signed up |
| username_exists | The username you are attempting to sign up with is already in use |
Log in
In the case of a failed login, the most common errors are:
| Error | Description |
|---|---|
| access_denied | When using web-based authentication, the resource server denies access per OAuth2 specifications |
| invalid_user_password | The username and/or password used for authentication are invalid |
| mfa_invalid_code | The multi-factor authentication (MFA) code provided by the user is invalid/expired |
| mfa_registration_required | The administrator has required multi-factor authentication, but the user has not enrolled |
| mfa_required | The user must provide the multi-factor authentication code to authenticate |
| password_leaked | If the password has been leaked and a different one needs to be used |
| PasswordHistoryError | The password provided for sign up/update has already been used (reported when password history feature is enabled) |
| PasswordStrengthError | The password provided does not match the connection's strength requirements |
| too_many_attempts | The account is blocked due to too many attempts to sign in |
| unauthorized | The user you are attempting to sign in with is blocked |