private static string GetAadGroupNameById(string groupId)
        {
            string groupName   = null;
            var    graphClient = new GraphClient("https://graph.windows.net/85c96496-fbc6-4bf3-bfcc-fb51ca874527");

            try
            {
                var groupNameTask = Task.Run(() => graphClient.GetGroupNameByIdAsync(groupId));//"29f4bef8-80bb-4afd-835f-16b3e0dbb537"
                groupName = groupNameTask.Result;
            }
            catch (Exception exception)
            {
                // look for specific exception in Graph Client library if groupId not found.
            }

            return(groupName);
        }