public override async Task AddToGroupAsync(string connectionId, string groupName, CancellationToken cancellationToken = default) { if (string.IsNullOrEmpty(connectionId)) { throw new ArgumentException(NullOrEmptyStringErrorMessage, nameof(connectionId)); } if (string.IsNullOrEmpty(groupName)) { throw new ArgumentException(NullOrEmptyStringErrorMessage, nameof(groupName)); } var api = await _restApiProvider.GetConnectionGroupManagementEndpointAsync(_appName, _hubName, connectionId, groupName); await _restClient.SendAsync(api, HttpMethod.Put, _productInfo, handleExpectedResponseAsync : null, cancellationToken : cancellationToken); }