PLEASE HELP - Custom Registration insert into Custom database

Hi folks,

I am exhausted trying to figure out what I have done wrong. I am making a Registration / Login page. I have followed this WIX tutorial Register User to Wix CRM and insert to custom database .

import wixUsers from 'wix-users';
import wixLocation from 'wix-location';
import wixWindow from 'wix-window';
import wixData from 'wix-data';
let registration;

$w.onReady(function () {

    //  $w("#termsBox").onChange((event) => {
    //   let isChecked = $w("#termsBox").checked; //This will return result of True or False
    //   if (isChecked) {
    //    $w("#registrationButton").enable();
    //   } else {
    //    $w("#registrationButton").disable();
    //   }
    //  });

    $w("#forgotPassword").onClick((event) => {
        wixUsers.promptForgotPassword()
            .then(() => {
                //
            })
            .catch((err) => {
                let errorMsg = err;
            });
    });

    if (wixUsers.currentUser.loggedIn) {
        wixLocation.to("/account/my-profile"); //Change the URL ending to the page you want to redirect the user if they are already logged in
    }

    $w("#registrationButton").onClick((event) => {
        console.log("Button was clicked"); //You can change the text of this line or delete it
        $w('#errorMessage').hide(); //We want to hide all error messages when the person attempts to register again
        $w('#emailExists').hide(); //We want to hide all error messages when the person attempts to register again
        if ($w("#email").valid && $w("#password").valid && $w("#firstName").valid && $w("#lastName").valid) {
            let email = $w("#email").value;
            let password = $w("#password").value;
            let first = $w("#firstName").value;
            let last = $w("#lastName").value;

            wixUsers.register(email, password, {
                    contactInfo: {
                        "firstName": first,
                        "lastName": last
                    }
                })
                .then((result) => {
                   //Question 1
                    $w("#MemberDetails").save()
                        .then((item) => {
                            wixLocation.to("/members/my-profile"); //Change the URL ending to the page you want to redirect the user after they successfully register
                        })
                        .catch((err) => {
                            let errMsg = err;
                        });
                })
                .catch((err) => {
                    let errorMsg = err;
                    console.log(err);
                    $w('#emailExists').show(); //This is were we prompt the message to show up again ONLY if there is an error
                });
            console.log("Trying to register"); //You can change the text of this line or delete it
        } else {
            $w('#errorMessage').show(); //This is were we prompt the message to show up again ONLY if there is an error
            console.log("Missing information"); //You can change the text of this line or delete it
        }

    });

});

When I run the page, and click the RegisterButton, I get this message “Cannot read properties of undefined (reading ‘status’)”.
When I test on my live site = It registers the user, but it doesn’t add an entry for the user into my MemberDetails database.

Question 1- Don’t I need to add an insert command before the $w(“#MemberDetails”).save()?

Can anyone PLEASE help me.

Thank you so much,
Sylvia