Doubt Json MVC Core Razor

I created a method to perform a Insert through Ajax , like this:

function SalvarHorario() 
{

    //NomeHorario
    var nome = $("#Nome").val();

    var token = $('input[name="__RequestVerificationToken"]').val();
    var tokenadr = 
        $('form[action="/Horario/Create"] input[name="__RequestVerificationToken"]').val();
    var headers = {};
    var headersadr = {};
    headers['__RequestVerificationToken'] = token;
    headersadr['__RequestVerificationToken'] = tokenadr;

    //Gravar
    var url = "/Horario/Create";

    $.ajax({
        url: url
        , type: 'POST'
        , headers: headersadr
        , data: { Id: 0, Nome: nome, __RequestVerificationToken: token }
        , success: function (data) {
            //if (data.Resultado > 0) {
            ListarItens(data.Resultado);
            //}
        }
    });
}

But it does not recognize the CREATE method that I call in Action, the page I'm getting the data from, was created by Razor CRUD. It only includes through the automatic class that is created:

public async Task<IActionResult> OnPostAsync()
{
            if (!ModelState.IsValid)
            {
                return Page();
            }

            _context.Horarios.Add(Horarios);
            await _context.SaveChangesAsync();
            return RedirectToPage("./Index");
}

I created a controller, and I need it to search the method of this controller, I tried to change its name, and nothing is right, it follows what method I need it to call:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Horarios h)
{
     if (ModelState.IsValid)
     {
           _context.Horarios.Add(h);
           _context.SaveChanges();
     }
     return Json(new { Resultado = h.Id });
 }

What am I doing wrong? If I take this code public async Task<IActionResult> OnPostAsync() it returns me Bad Request 400 error.

I've tried several ways none works, I'm learning MVC Core Entity Framework now, so I'm still getting a lot.