[URGENT] Need urgent help pls. Wix-users register is failing

I am trying to code a customize sign-up page for my store. I am using the following code to capture data:

// API Reference: https://www.wix.com/velo/reference/api-overview/introduction
// “Hello, World!” Example: https://learn-code.wix.com/en/article/1-hello-world

import wixUsers from 'wix-users';

$w.onReady(function () {

  $w('#button6').onClick( () => {
    let emails = [];
    let labels = [];
      
    emails.push($w('#input6').value);
    const IdNo = $w('#input9').value;

    // register as member using form data
    wixUsers.register($w('#input6').value, $w('#input5').value, {
      "contactInfo": {
        "firstName": $w('#input8').value,
        "lastName": $w('#input7').value,
        "emails": emails,
        "labels": labels,
        "IdNo": $w('#input9').value
      }
    });
      
  });
});

Why is it failing with the following error:
//ERROR : ‘“IdNo”’ does not exist in type ‘ContactInfo’. It’s recommended you use a new variable, such as “let newVar = …” to make sure that all code completion work correctly.

IdNo is a custom field I already defined in my ‘Contacts’

import wixUsers from 'wix-users';

$w.onReady(function () {
  $w('#button6').onClick(() => {
    let emails = [], labels = [];
      
    emails.push($w('#input6').value); // here you get an ARRAY of Emails--> [x,y,z]
    const IdNo = $w('#input9').value; // here you define your IdNo --> 12345
    
  // register as member using form data
    wixUsers.register($w('#input6').value, $w('#input5').value, {
      "contactInfo": {
        "firstName": $w('#input8').value,
        "lastName": $w('#input7').value,
        "emails": emails,
        "labels": labels,
        "IdNo": $w('#input9').value // <--- why again? It was already defined!
        "IdNo":  IdNo <---------------!!!
      }
    });
      
  });
});

But i do not believe that my suggestion will solve your issue, since the error message tells you, that your → <— is not existing in your Contacts-Info!

//ERROR : ‘“IdNo”’ does not exist in type ‘ContactInfo’.

Perhaps wrong ID ?
And without IdNo, your registration works?