unsupportedgranttype
Unsupportedgranttype is a term sometimes used to describe an OAuth 2.0 error condition in which the authorization server does not support the grant type requested by a client. In the official OAuth 2.0 error model, this condition is communicated by the error parameter unsupported_grant_type in the token endpoint response, usually accompanied by a 400 Bad Request status.
In OAuth 2.0, a client makes a token request with a grant_type parameter that indicates the preferred
Common causes include using a grant type that is not enabled on the server, requesting a deprecated
This error is distinct from other OAuth errors such as invalid_request, invalid_client, or access_denied. Proper handling