Verify if the client has scopes

[nesanmano]

I am looking for a way to verify if a client a has a scope.

            if (_client.Scope == null) return false;
            if (scopes == null || scopes.Length == 0) return true;

            return scopes.Select(scope =>
                scope.ToString().ToLower()).All(s => _client.Scope.Contains(s));

The problem is I can't find a property called scope within the client.