If your callback URL is valid, when an authorization error occurs, the Authorization Server returns the appropriate error and state parameters to your callback URL. In cases where your callback URL is invalid, your application will display the default generic Auth0 error page. Alternatively, you can customize the error pages. To learn more, read Custom Error Pages.

To find the default page name for the generic error page, see Use Version Control to Manage Your Universal Login Pages.

The generic error page displays the following information if you have configured the associated fields in your Tenant Settings.

Field	Description
Friendly Name	Name of your company
Logo URL	URL of your company logo
Support Email	Email address of your company's support team
Support URL	URL of your company's support page

The Authorization Server returns parameters appended to the URL as a query string.

Parameter	Description
client_id	Identifier for the Auth0 application
connection	Connection used at the time of error
lang	Language set for use at the time of error
error	Status code corresponding to the error
error_description	Description of the error
tracking_id	Identifier used by Auth0 support to find errors in internal logs
log_url	Link to the error in your tenant logs

Parameters presented vary depending on the error type and are specific to the request. For example, if the request did not contain a client_id and resulted in an error, no client ID will be returned by the error page.

• Customize Error Pages
• Brand: Emails and Error Pages