HI,

For the ShareWorklist method, if you use the overload with 2 input, the first parameter is "ManagedUserName". Not very sure what this is for, but the "Managed" wording usually means the manager account. So, you code should be using the overload with the WorklistShare input only.

I tested this code to be working fine in impersonating and setting OOF:

public void SetMyOOFStatus(bool OOF)
        {
            Console.WriteLine("Executing SetMyOOFStatus");

            SCWFC.Connection wfConn = new SCWFC.Connection();
            try
            {
                wfConn.Open(SERVER_NAME);
                wfConn.ImpersonateUser("K2:K2Trainhrmgr1");

                if (OOF)
                {
                    //Create a share
                    SCWFC.WorklistShare wlShare = new SCWFC.WorklistShare();
                    wlShare.ShareType = SCWFC.ShareType.OOF;
                    wlShare.StartDate = DateTime.Now;
                    wlShare.EndDate = DateTime.Now.AddDays(1);

                    //Forward destination
                    SCWFC.WorkType wtShare = new SCWFC.WorkType("normal");
                    wtShare.WorklistCriteria.Platform = "ASP";
                    wtShare.Destinations.Add(new SCWFC.Destination(@"K2:k2trainhradmin1", SCWFC.DestinationType.User));

                    //Exception destination
                    //SCWFC.WorkTypeException wtExp = new SCWFC.WorkTypeException("except");
                    //wtExp.WorklistCriteria.Platform = "ASP";
                    //wtExp.WorklistCriteria.AddFilterField(SCWFC.WCField.ProcessName, SCWFC.WCCompare.Equal, "ExpenseReview");
                    //wtExp.Destinations.Add(new SCWFC.Destination(@"K2:K2Trainizmgr1", SCWFC.DestinationType.User));
                    //wtShare.WorkTypeExceptions.Add(wtExp);

                    //add to worklistshare
                    wlShare.WorkTypes.Add(wtShare);
                    //remove all existing share
                    wfConn.UnShareAll();
                    //add WorklistShare
                    wfConn.ShareWorkList(wlShare);
                    //set user to be OOF
                    wfConn.SetUserStatus(SCWFC.UserStatuses.OOF);
                }
                else
                {
                    wfConn.UnShareAll();
                    wfConn.SetUserStatus(SCWFC.UserStatuses.Available);
                }
            }
            finally
            {
                wfConn.Dispose();
            }
        }

Good luck

JK