A JSFL command to change the RGB% values of advanced color effects of a symbol

I will admit I tried Google Gemini for some assistance in code, but the code does run, but there is no changes to the color at all, I got an example code here after some difficulty.

function randomizeAdvancedColor() {
    var dom = fl.getDocumentDOM();
    if (!dom) {
        fl.trace("Please open an Adobe Animate document.");
        return;
    }

    var selection = dom.selection;

    if (!selection || selection.length === 0) {
        fl.trace("No items are selected. Select one or more MovieClip or Graphic instances.");
        return;
    }

    // Check for syntax error here (Likely line 20)
    for (var i = 0; i < selection.length; i++) {
        var element = selection[i];

        if (element.instanceType === "symbol") {

            var rgbMultipliers = getRandomConstrainedRGB();
            var rM = rgbMultipliers[0]; 
            var gM = rgbMultipliers[1];
            var bM = rgbMultipliers[2];

            var newColorMatrix = [
                rM, 0, 0, 0, 0,  
                0, gM, 0, 0, 0,  
                0, 0, bM, 0, 0,
                0, 0, 0, 1, 0    
            ];

            element.colorEffect = {
                'id': 'advanced', 
                'colorMatrix': newColorMatrix
            };
        }
    }

    dom.zoom = dom.zoom; 
    
    fl.trace("Successfully applied random constrained Advanced Color Effects to " + selection.length + " selected instances.");
}

 When I did other codes for tasks such as unselecting half of objects, or changing rotation transform to a random degree, those worked, but anything related to "color effects" on a symbol does nothing at all. Is there something I'm doing wrong? I only am trying to make my editing fast so I don't have to manually set tint colors to like 50 objects on a stage.