Cookies are exchanged via GET/POST communication and login processing

I am using Google apps script.

I am logging in to a site.

var LOGIN_URL="********"; 
var userid="********"; 
var password = "**********";
var source_URL = "**********";

var options = {
  method: "post",
  followRedirects: true,
  contentType: "applicationxml; charset=utf-8",
  payload: {
    userId: userid,
    password —Password
  }
};

var response=UrlFetchApp.fetch(LOGIN_URL, options);
var headers=response.getAllHeaders();

I set the options as above and logged in.
Also, in the header information obtained,

Set-Cookie=[Ljava.lang.Object;@6eee775a, Vary=Accept-Encoding, X-XSS-Protection=1; mode=block, Content-Type=text/html; charset=utf-8}

is available.
It is also stored in the variable cookies.

 if(typeof headers['Set-Cookie']!=='undefined'){
  var cookies = type of headers ['Set-Cookie'] == 'string' ? [ headers ['Set-Cookie' ] : headers ['Set-Cookie' ] ;
  for (vari=0;i<cookies.length;i++) {
      cookies[i] = cookies[i].split(';')[0];
  };
}

As a result

cookies[0]:tracking_code=eafdc5ca82ea6d8bfc0b1d147efc6efefe31e2f5
cookies[1]:_huntr_session_production=UEhGdDdVZVR5Ny8wL2JROGZwRFBFTTRjBYSklJUXBvdjNacFhlbUEyLzFCNHVhL0hrWWlVYUvb1drL094cDRGUUgraHVCbVV1Wk0yV2YV2YYYYWlV2YYRwTTM0M0R0RMY1R0R0RVY1R0R0R0MY1R0R0EhGblZmZXdxWDh1Qy8wcTd2QUJ3VWR5UXh5MUFselNWSjc5b1FTNHdnbWhPdFl6WkhybkRZM1JtSE5VQUZUZm91cExuT2h4UGtBbnQwbjVLTUtFeklCSVBmTU12RZTUZZTU12RZUZZT6WkFXFXFXFXFXFXFXT6WkUZUZUZUZUZ

It is shown that
Then pass cookies through the post method to perform the login process.

var options2={
  method: "get",
  followRedirects: true,
  headers:{
    Cookies: cookies.join(';')
  }
};

varsource=UrlFetchApp.fetch(source_URL, options2);
var headers2 = source.getAllHeaders();
var content=source.getContentText();

However, when you print content on a spreadsheet, you see HTML for pages that are not logged in.

The questions are as follows.
①Why are you not logged in?
⓶What part of the code should I change?
⓷If the code is not specifically incorrect, is the login process wrong in the first place (e.g., depending on the authentication method)?

If there is any missing information, I will reply to you.

I look forward to your kind cooperation.