Raise on unsupported tokens.

def _raise_on_unsupported_token(self, request):
        """Raise on unsupported tokens."""
        if (request.token_type_hint and
            request.token_type_hint in self.valid_token_types and
            request.token_type_hint not in self.supported_token_types):
            raise UnsupportedTokenTypeError(request=request)