Contain window in an iframe

was making a window to show a result of another web page that requires the sending of data by POST. So far no problem, I open a form and send it and it works correctly. The problem comes when I want to put it in an IFRAME (to be shown in a box in my venatana, the POST values are not sent.

PHP Code

    <div class="col-md-12">
       <form id="envio_datos" class="hidden" action="https://sis-t.redsys.es:25443/sis/realizarPago" method="POST" target="iframe_marco">
            Ds_SignatureVersion:<input type="text" id="Ds_SignatureVersion" name="Ds_SignatureVersion" value=""/><br>
            Ds_MerchantParameters:<input type="text" id="Ds_MerchantParameters" name="Ds_MerchantParameters" value=""/><br>
            Ds_Signature:<input type="text" id="Ds_Signature" name="Ds_Signature" value=""/><br>
            <input id="realizarPago" type="submit" value="Realizar Pago"/>

</form>
<div class="table-responsive" id="iframe_resultado" height="500" width="100%">

    </div>  
</div>

JS code

>                         //$('#envio_datos').removeClass("hidden");
                        $('#enviar_datos').attr('action', url);
                        $('#Ds_SignatureVersion').val(signature_version);
                        $('#Ds_Signature').val(signature);
                        $('#Ds_MerchantParameters').val(parameters);


    $('#row_aviso').removeClass('d-none');
    $('#row_aviso').show();
    //var html_iframe = '<iframe id="iframe_marco" src="' + url + '" height="500" width="100%"></iframe>';
//  $('#iframe_resultado').html(html_iframe);
    $('#row_webinit').removeClass('d-none');
    $('#row_webinit').show(1500);