Issue approval index action not redirect to pending action view although no error on debug code?

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Ajax

jQuery

WebAPI

MVC5

I work on ASP.NET MVC Project. I face issue action ApprovalIndex Not redirect to action PendingManagersRequests although no error happens.

I debug and trace breakpoint until I reach action PendingManagersRequests and trace until I reach to view return View(vmr); without any issues.

So why is it not redirecting to view PendingManagersRequests although no issues happen.

What I have tried:

1. When click button approves submit, it updates table column SpeakStuffComment based on Request No:

using (Html.BeginForm("ApprovalIndex", 
    "Resignation", new { id = Model.RequestNo }, FormMethod.Post, 
     htmlAttributes: new { @style = "display:inline;" }))
        {
            @Html.AntiForgeryToken()
        
            < a onclick="submit();" class="btn btn-primary" 
            style="min-width: 100px;
            margin-left: 5px;">class="glyphicon glyphicon-ok"> 
         Approve </a>
        }

2- When click approve button, it calls ApprovalIndex on controller ResignationController:

public class ResignationController : Controller
    {
[HttpPost]
        public async Task<ActionResult> ApprovalIndex(ResignationRequester REQ)
        {
            string errorMsg = string.Empty;
            string requestStatus;           

                 Workforce.ResignationUpdateLineManangerApproval
                 (id, true,Convert.ToInt32(Session[SessionKeys.UserCode]));
                    return RedirectToAction("PendingManagersRequests", 
                   new { msg = $"Request NO {REQ.RequestNo} 
                         has been accepted " + $"successfully." });
        }
   }

3 - jquery call action approvalIndex on resignation controller:

    function submit() {
        var ResignationRequester = new Object();
        ResignationRequester.RequestNo = 
            document.getElementById("RequestNo").innerHTML.trim();
        ResignationRequester.EmpID = 
            document.getElementById("EmpID").innerHTML.trim();
        ResignationRequester.SpeakStuffComment = 
            document.getElementById("SpeakStuffComment").value;

        if (ResignationRequester != null) {
            $.ajax({
                type: "POST",
                url: '@Url.Action("ApprovalIndex", "Resignation")',
                data: JSON.stringify(ResignationRequester),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {
                    console.log(response);
                },
                failure: function (response) {
                    alert(response.responseText);
                },
                error: function (response) {
                    alert(response.responseText);
                }
            });
        }
    }
public async Task<ActionResult> PendingManagersRequests
(string msg, string errorMsg)
    {       
        ViewModelRequests vmr = new ViewModelRequests();
      
        vmr.MyRequests = Workforce.GetPendingToDisplayMyRequests
                         (Session[SessionKeys.UserCode].ToString());
                
        ViewBag.msg = msg;
        ViewBag.errorMsg = errorMsg;
        return View(vmr);
    }