WellKnown endpoint doesn't return supported types of client authentication

token_endpoint_auth_methods_supported
    OPTIONAL. JSON array containing a list of Client Authentication methods supported by this 
Token Endpoint. The options are client_secret_post, client_secret_basic, client_secret_jwt, and 
private_key_jwt, as described in Section 9 of OpenID Connect Core 1.0 [OpenID.Core]. Other 
authentication methods MAY be defined by extensions. If omitted, the default is client_secret_basic 
-- the HTTP Basic Authentication Scheme specified in Section 2.3.1 of OAuth 2.0 [RFC6749]. 

token_endpoint_auth_signing_alg_values_supported
    OPTIONAL. JSON array containing a list of the JWS signing algorithms (alg values) supported 
by the Token Endpoint for the signature on the JWT [JWT] used to authenticate the Client at the 
Token Endpoint for the private_key_jwt and client_secret_jwt authentication methods. Servers 
SHOULD support RS256. The value none MUST NOT be used.