Project Server (using CSOM)- How to Disable Recall button on all timesheets after period approval

Question

In Microsoft Project server: After all timesheets have been submitted and approved I need to disable the button Recall to prevent mistakes.

Here is a part of test code:

DateTime _startDateParameter = new DateTime(2022, 10, 1);
DateTime __endDateParameter = new DateTime(2022, 10, 1);

using (projContext)
{

    var tsp = projContext.TimeSheetPeriods;
    projContext.Load(tsp, c => c.Where(p => p.Start <= 
                     _startDateParameter && p.End >= __endDateParameter));                                            
    projContext.ExecuteQuery();

    var myPeriod = projContext.TimeSheetPeriods.FirstOrDefault();
    Console.WriteLine("\n\t{0} {1} {2}", myPeriod.Name.ToString(), myPeriod.Start.ToString(), myPeriod.End.ToString());

    var tms = myPeriod.TimeSheet;
    var lines = tms.Lines;
    var creator = tms.Creator;
    var manager = tms.Manager;
    projContext.Load(tms);
    projContext.Load(lines);
    projContext.Load(creator);
    projContext.Load(manager);
    projContext.ExecuteQuery();                              
    Console.WriteLine("\t\tName    = {0} , Status  = {1}, IsProcessed = {2}", tms.Name.ToString(), tms.Status.ToString(), tms.IsProcessed.ToString());
    Console.WriteLine("\t\tCreator = {0} , Manager = {1}", creator.Title, manager.Title);

    //tms.IsProcessed = true;
    //tms.Name = "My Locked Timesheet";
    tms.Update();
    projContext.ExecuteQuery();
}

The two problems I have:

1. I can only get my timesheet. I need to get all timesheets for a specific period. I do not know if I can call something like start delegate!?
2. If I uncomment the change to tms.IsProcessed or tms.Name, then I get an error dialog " An unhandled exception of type 'Microsoft.SharePoint.Client.ServerException' occurred in Microsoft.SharePoint.Client.Runtime.dll Additional information: PJClientCallableException: GeneralSecurityAccessDenied"

thanks