This means there’s an error with the integration between the application you are connecting to and Krystal Identity. Contact the developer of the application you are trying to use to try and resolve this issue. Additional information is provided below which may be useful to them.
The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed. The 'redirect_uri' parameter does not match any of the OAuth 2.0 Client's pre-registered redirect urls.