Modify position isn't working

Hello everyone, 
I will add the code snippets that might affect these modify position signature to not work, please clarify the problem to be, Thanks.

the following three (modifyposition)s don't work

    private double GlobalAtrThreshold;
    private double  GlobalAtrPips;
    private bool isTradeActive = false;
    private bool IsItLong = false;
    private bool IsItShort = false;

protected override void OnStart() {

 isTradeActive = false;
      IsItLong = false;
      IsItShort = false;}

 protected override void OnBarClosed() {
    
    // Ensure we are not trading when a trade is still active
    if (isTradeActive) {
        return; // Skip this cycle if a trade is already open
    }

 ExecuteMarketOrder(TradeType.Buy, SymbolName, TradeVolume, "Buy Signal",  StopLossAtr, null);
      
        IsItLong = true;
        isTradeActive = true; // Set the flag to true when trade is opened
        
         GlobalAtrThreshold = atr.Result.Last(1) ;
         GlobalAtrPips = Math.Round(atr.Result.Last(1)/Symbol.PipSize,4) ;

The execute market order for selling makes IsLtLong boolean ture.

  protected override void OnTick() {
      
     // Reset positions if they are closed
     if (Positions.Count == 0) {
        isTradeActive = false;
        IsItLong = false;
        IsItShort = false;
   }
  
   
   
   

     {
    
    
     foreach (var position in Positions) {
    
      if (IsItLong != false && position.Quantity > 0) {
     

        // break even
        if (Symbol.Ask >= position.EntryPrice + (1.0 * GlobalAtrThreshold)) {
          
          position.ModifyStopLossPips(GlobalAtrPips);
        }
        // Close part of the buy position
if (Symbol.Ask >= position.EntryPrice + (1.0 * GlobalAtrThreshold) && position.Quantity > VolumeToClose)
{
    position.ModifyVolume(VolumeToClose);
   
 
}
        // Check for trailing stop loss condition
        if (Symbol.Ask >= position.EntryPrice + (1.5 * GlobalAtrThreshold)) {
          // Set trailing stop loss
          position.ModifyTrailingStop(true);
    
        }
      }

      if (IsItShort != false && position.Quantity > 0) {
        //double atrValueInPips = atr.Result.Last(1) * Symbol.PipSize;

        // Break even
        if (Symbol.Bid <= position.EntryPrice - (1.0 * GlobalAtrThreshold)) {
     
         position.ModifyStopLossPips(GlobalAtrPips);
        }
         // Close part of the buy position
        if (Symbol.Bid <= position.EntryPrice - (1.0 * GlobalAtrThreshold) && position.Quantity > VolumeToClose)
{
    
    position.ModifyVolume(VolumeToClose);
        // trailing stop loss condition
            if (Symbol.Bid <= position.EntryPrice - (1.5 * GlobalAtrThreshold)) {
          // Set trailing stop loss
      position.ModifyTrailingStop(true);
     
        }
      }
    }
    }
      

    }}