after call approval index action pending manager view not display and

I work on asp.net mvc Project .I face issue action ApprovalIndex Not redirect to action PendingManagersRequests although no error happen .

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

so why it not redirect to view PendingManagersRequests Although no issues happen

steps to my code

1- when click button approve submit it update 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;"><i class="glyphicon glyphicon-ok"></i> Approve </a>
        }

2- when click approve button it call ApprovalIndex on controller ResignationController

public class ResignationController : Controller
    {

        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);
    }

finally I get only this popup localhost say although from action approvalindex no error