Site collection Feature Activation using CSOM Code. public static void ActivateFeature(string webFullUrl, Guid featureId, bool force, FeatureDefinitionScope featdefScope) { try { using (var ctx = new ClientContext(webFullUrl)) { var features = ctx.Site.Features; ctx.Load(features); ctx.ExecuteQuery(); features.Add(featureId, force, featdefScope); ctx.ExecuteQuery(); ...