The resource owner or authorization server denied the request.

The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed.

The requested scope is invalid, unknown, or malformed.

The authorization server encountered an unexpected condition that prevented it from fulfilling the request.

The authorization server is currently unable to handle the request due to a temporary overloading or maintenance of the server.

The client is not authorized to request an authorization code using this method.

The authorization server does not support obtaining an authorization code using this method.